rtc-generic.c

Go to the documentation of this file.

/* rtc-generic: RTC driver using the generic RTC abstraction
 *
 * Copyright (C) 2008 Kyle McMartin <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>

#include <asm/rtc.h>

static int generic_get_time(struct device *dev, struct rtc_time *tm)
{
    unsigned int ret = get_rtc_time(tm);

    if (ret & RTC_BATT_BAD)
        return -EOPNOTSUPP;

    return rtc_valid_tm(tm);
}

static int generic_set_time(struct device *dev, struct rtc_time *tm)
{
    if (set_rtc_time(tm) < 0)
        return -EOPNOTSUPP;

    return 0;
}

static const struct rtc_class_ops generic_rtc_ops = {
    .read_time = generic_get_time,
    .set_time = generic_set_time,
};

static int __init generic_rtc_probe(struct platform_device *dev)
{
    struct rtc_device *rtc;

    rtc = rtc_device_register("rtc-generic", &dev->dev, &generic_rtc_ops,
                  THIS_MODULE);
    if (IS_ERR(rtc))
        return PTR_ERR(rtc);

    platform_set_drvdata(dev, rtc);

    return 0;
}

static int __exit generic_rtc_remove(struct platform_device *dev)
{
    struct rtc_device *rtc = platform_get_drvdata(dev);

    rtc_device_unregister(rtc);

    return 0;
}

static struct platform_driver generic_rtc_driver = {
    .driver = {
        .name = "rtc-generic",
        .owner = THIS_MODULE,
    },
    .remove = __exit_p(generic_rtc_remove),
};

static int __init generic_rtc_init(void)
{
    return platform_driver_probe(&generic_rtc_driver, generic_rtc_probe);
}

static void __exit generic_rtc_fini(void)
{
    platform_driver_unregister(&generic_rtc_driver);
}

module_init(generic_rtc_init);
module_exit(generic_rtc_fini);

MODULE_AUTHOR("Kyle McMartin <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic RTC driver");
MODULE_ALIAS("platform:rtc-generic");