linux/drivers/rtc/rtc-test.c
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   1/*
   2 * An RTC test device/driver
   3 * Copyright (C) 2005 Tower Technologies
   4 * Author: Alessandro Zummo <a.zummo@towertech.it>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/err.h>
  13#include <linux/rtc.h>
  14#include <linux/platform_device.h>
  15
  16static struct platform_device *test0 = NULL, *test1 = NULL;
  17
  18static int test_rtc_read_alarm(struct device *dev,
  19        struct rtc_wkalrm *alrm)
  20{
  21        return 0;
  22}
  23
  24static int test_rtc_set_alarm(struct device *dev,
  25        struct rtc_wkalrm *alrm)
  26{
  27        return 0;
  28}
  29
  30static int test_rtc_read_time(struct device *dev,
  31        struct rtc_time *tm)
  32{
  33        rtc_time_to_tm(get_seconds(), tm);
  34        return 0;
  35}
  36
  37static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
  38{
  39        dev_info(dev, "%s, secs = %lu\n", __func__, secs);
  40        return 0;
  41}
  42
  43static int test_rtc_proc(struct device *dev, struct seq_file *seq)
  44{
  45        struct platform_device *plat_dev = to_platform_device(dev);
  46
  47        seq_printf(seq, "test\t\t: yes\n");
  48        seq_printf(seq, "id\t\t: %d\n", plat_dev->id);
  49
  50        return 0;
  51}
  52
  53static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
  54{
  55        return 0;
  56}
  57
  58static const struct rtc_class_ops test_rtc_ops = {
  59        .proc = test_rtc_proc,
  60        .read_time = test_rtc_read_time,
  61        .read_alarm = test_rtc_read_alarm,
  62        .set_alarm = test_rtc_set_alarm,
  63        .set_mmss = test_rtc_set_mmss,
  64        .alarm_irq_enable = test_rtc_alarm_irq_enable,
  65};
  66
  67static ssize_t test_irq_show(struct device *dev,
  68                                struct device_attribute *attr, char *buf)
  69{
  70        return sprintf(buf, "%d\n", 42);
  71}
  72static ssize_t test_irq_store(struct device *dev,
  73                                struct device_attribute *attr,
  74                                const char *buf, size_t count)
  75{
  76        int retval;
  77        struct platform_device *plat_dev = to_platform_device(dev);
  78        struct rtc_device *rtc = platform_get_drvdata(plat_dev);
  79
  80        retval = count;
  81        if (strncmp(buf, "tick", 4) == 0 && rtc->pie_enabled)
  82                rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
  83        else if (strncmp(buf, "alarm", 5) == 0) {
  84                struct rtc_wkalrm alrm;
  85                int err = rtc_read_alarm(rtc, &alrm);
  86
  87                if (!err && alrm.enabled)
  88                        rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
  89
  90        } else if (strncmp(buf, "update", 6) == 0 && rtc->uie_rtctimer.enabled)
  91                rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
  92        else
  93                retval = -EINVAL;
  94
  95        return retval;
  96}
  97static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
  98
  99static int test_probe(struct platform_device *plat_dev)
 100{
 101        int err;
 102        struct rtc_device *rtc;
 103
 104        rtc = devm_rtc_device_register(&plat_dev->dev, "test",
 105                                &test_rtc_ops, THIS_MODULE);
 106        if (IS_ERR(rtc)) {
 107                err = PTR_ERR(rtc);
 108                return err;
 109        }
 110
 111        err = device_create_file(&plat_dev->dev, &dev_attr_irq);
 112        if (err)
 113                goto err;
 114
 115        platform_set_drvdata(plat_dev, rtc);
 116
 117        return 0;
 118
 119err:
 120        return err;
 121}
 122
 123static int test_remove(struct platform_device *plat_dev)
 124{
 125        device_remove_file(&plat_dev->dev, &dev_attr_irq);
 126
 127        return 0;
 128}
 129
 130static struct platform_driver test_driver = {
 131        .probe  = test_probe,
 132        .remove = test_remove,
 133        .driver = {
 134                .name = "rtc-test",
 135                .owner = THIS_MODULE,
 136        },
 137};
 138
 139static int __init test_init(void)
 140{
 141        int err;
 142
 143        if ((err = platform_driver_register(&test_driver)))
 144                return err;
 145
 146        if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
 147                err = -ENOMEM;
 148                goto exit_driver_unregister;
 149        }
 150
 151        if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
 152                err = -ENOMEM;
 153                goto exit_put_test0;
 154        }
 155
 156        if ((err = platform_device_add(test0)))
 157                goto exit_put_test1;
 158
 159        if ((err = platform_device_add(test1)))
 160                goto exit_del_test0;
 161
 162        return 0;
 163
 164exit_del_test0:
 165        platform_device_del(test0);
 166
 167exit_put_test1:
 168        platform_device_put(test1);
 169
 170exit_put_test0:
 171        platform_device_put(test0);
 172
 173exit_driver_unregister:
 174        platform_driver_unregister(&test_driver);
 175        return err;
 176}
 177
 178static void __exit test_exit(void)
 179{
 180        platform_device_unregister(test0);
 181        platform_device_unregister(test1);
 182        platform_driver_unregister(&test_driver);
 183}
 184
 185MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 186MODULE_DESCRIPTION("RTC test driver/device");
 187MODULE_LICENSE("GPL");
 188
 189module_init(test_init);
 190module_exit(test_exit);
 191
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