rtc-test.c

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/*
 * An RTC test device/driver
 * Copyright (C) 2005 Tower Technologies
 * Author: Alessandro Zummo <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>

static struct platform_device *test0 = NULL, *test1 = NULL;

static int test_rtc_read_alarm(struct device *dev,
    struct rtc_wkalrm *alrm)
{
    return 0;
}

static int test_rtc_set_alarm(struct device *dev,
    struct rtc_wkalrm *alrm)
{
    return 0;
}

static int test_rtc_read_time(struct device *dev,
    struct rtc_time *tm)
{
    rtc_time_to_tm(get_seconds(), tm);
    return 0;
}

static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
{
    dev_info(dev, "%s, secs = %lu\n", __func__, secs);
    return 0;
}

static int test_rtc_proc(struct device *dev, struct seq_file *seq)
{
    struct platform_device *plat_dev = to_platform_device(dev);

    seq_printf(seq, "test\t\t: yes\n");
    seq_printf(seq, "id\t\t: %d\n", plat_dev->id);

    return 0;
}

static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
{
    return 0;
}

static const struct rtc_class_ops test_rtc_ops = {
    .proc = test_rtc_proc,
    .read_time = test_rtc_read_time,
    .read_alarm = test_rtc_read_alarm,
    .set_alarm = test_rtc_set_alarm,
    .set_mmss = test_rtc_set_mmss,
    .alarm_irq_enable = test_rtc_alarm_irq_enable,
};

static ssize_t test_irq_show(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    return sprintf(buf, "%d\n", 42);
}
static ssize_t test_irq_store(struct device *dev,
                struct device_attribute *attr,
                const char *buf, size_t count)
{
    int retval;
    struct platform_device *plat_dev = to_platform_device(dev);
    struct rtc_device *rtc = platform_get_drvdata(plat_dev);

    retval = count;
    if (strncmp(buf, "tick", 4) == 0 && rtc->pie_enabled)
        rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
    else if (strncmp(buf, "alarm", 5) == 0) {
        struct rtc_wkalrm alrm;
        int err = rtc_read_alarm(rtc, &alrm);

        if (!err && alrm.enabled)
            rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);

    } else if (strncmp(buf, "update", 6) == 0 && rtc->uie_rtctimer.enabled)
        rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
    else
        retval = -EINVAL;

    return retval;
}
static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);

static int test_probe(struct platform_device *plat_dev)
{
    int err;
    struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
                        &test_rtc_ops, THIS_MODULE);
    if (IS_ERR(rtc)) {
        err = PTR_ERR(rtc);
        return err;
    }

    err = device_create_file(&plat_dev->dev, &dev_attr_irq);
    if (err)
        goto err;

    platform_set_drvdata(plat_dev, rtc);

    return 0;

err:
    rtc_device_unregister(rtc);
    return err;
}

static int __devexit test_remove(struct platform_device *plat_dev)
{
    struct rtc_device *rtc = platform_get_drvdata(plat_dev);

    rtc_device_unregister(rtc);
    device_remove_file(&plat_dev->dev, &dev_attr_irq);

    return 0;
}

static struct platform_driver test_driver = {
    .probe  = test_probe,
    .remove = __devexit_p(test_remove),
    .driver = {
        .name = "rtc-test",
        .owner = THIS_MODULE,
    },
};

static int __init test_init(void)
{
    int err;

    if ((err = platform_driver_register(&test_driver)))
        return err;

    if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
        err = -ENOMEM;
        goto exit_driver_unregister;
    }

    if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
        err = -ENOMEM;
        goto exit_free_test0;
    }

    if ((err = platform_device_add(test0)))
        goto exit_free_test1;

    if ((err = platform_device_add(test1)))
        goto exit_device_unregister;

    return 0;

exit_device_unregister:
    platform_device_unregister(test0);

exit_free_test1:
    platform_device_put(test1);

exit_free_test0:
    platform_device_put(test0);

exit_driver_unregister:
    platform_driver_unregister(&test_driver);
    return err;
}

static void __exit test_exit(void)
{
    platform_device_unregister(test0);
    platform_device_unregister(test1);
    platform_driver_unregister(&test_driver);
}

MODULE_AUTHOR("Alessandro Zummo <[email protected]>");
MODULE_DESCRIPTION("RTC test driver/device");
MODULE_LICENSE("GPL");

module_init(test_init);
module_exit(test_exit);