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    Subject[PATCH 4/5] [RTC] Add Freescale MC13783 RTC driver
    Date
    This driver provides support for the RTC part integrated into
    the Freescale MC13783 PMIC.

    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
    Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
    Cc: Alessandro Zummo <a.zummo@towertech.it>
    Cc: rtc-linux@googlegroups.com
    ---
    drivers/rtc/Kconfig | 6 ++
    drivers/rtc/Makefile | 1 +
    drivers/rtc/rtc-mc13783.c | 141 +++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 148 insertions(+), 0 deletions(-)
    create mode 100644 drivers/rtc/rtc-mc13783.c

    diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
    index 81adbdb..e4a242f 100644
    --- a/drivers/rtc/Kconfig
    +++ b/drivers/rtc/Kconfig
    @@ -759,4 +759,10 @@ config RTC_DRV_PS3
    This driver can also be built as a module. If so, the module
    will be called rtc-ps3.

    +config RTC_DRV_MC13783
    + depends on MFD_MC13783
    + tristate "Freescale MC13783 RTC"
    + help
    + This enables support for the Freescale MC13783 PMIC RTC
    +
    endif # RTC_CLASS
    diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
    index 3c0f2b2..00bf66d 100644
    --- a/drivers/rtc/Makefile
    +++ b/drivers/rtc/Makefile
    @@ -78,3 +78,4 @@ obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
    obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
    obj-$(CONFIG_RTC_DRV_PCF50633) += rtc-pcf50633.o
    obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o
    +obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
    diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
    new file mode 100644
    index 0000000..d1f1192
    --- /dev/null
    +++ b/drivers/rtc/rtc-mc13783.c
    @@ -0,0 +1,141 @@
    +/*
    + * 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/interrupt.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/ioctl.h>
    +#include <linux/time.h>
    +#include <linux/rtc.h>
    +
    +struct mc13783_rtc {
    + struct rtc_device *rtc;
    + struct mc13783 *mc13783;
    +};
    +
    +static int mc13783_rtc_set_time(struct device *dev, struct rtc_time *tm)
    +{
    + struct mc13783_rtc *priv = dev_get_drvdata(dev);
    + unsigned int seconds, days;
    + unsigned long s1970;
    +
    + rtc_tm_to_time(tm, &s1970);
    +
    + seconds = s1970 % 86400;
    + days = s1970 / 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 0;
    +}
    +
    +static const struct rtc_class_ops mc13783_rtc_ops = {
    + .read_time = mc13783_rtc_read_time,
    + .set_time = mc13783_rtc_set_time,
    +};
    +
    +static int 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 = pdev->dev.platform_data;
    + 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 __exit 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 = {
    + .probe = mc13783_rtc_probe,
    + .remove = __exit_p(mc13783_rtc_remove),
    + .driver = {
    + .name = "mc13783-rtc",
    + .owner = THIS_MODULE,
    + },
    +};
    +
    +static int __init mc13783_rtc_init(void)
    +{
    + return platform_driver_register(&mc13783_rtc_driver);
    +}
    +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");
    +MODULE_DESCRIPTION("RTC driver for Freescale MC13783 PMIC");
    +MODULE_LICENSE("GPL");
    --
    1.6.3.3


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