drivers/rtc/rtc-test.c

   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
  16 static struct platform_device *test0 = NULL, *test1 = NULL;
  17
  18 static int test_rtc_read_alarm(struct device *dev,
  19         struct rtc_wkalrm *alrm)
  20 {
  21         return 0;
  22 }
  23
  24 static int test_rtc_set_alarm(struct device *dev,
  25         struct rtc_wkalrm *alrm)
  26 {
  27         return 0;
  28 }
  29
  30 static 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
  37 static 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
  43 static 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
  53 static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
  54 {
  55         return 0;
  56 }
  57
  58 static 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
  67 static ssize_t test_irq_show(struct device *dev,
  68                                 struct device_attribute *attr, char *buf)
  69 {
  70         return sprintf(buf, "%d\n", 42);
  71 }
  72 static 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 }
  97 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
  98
  99 static 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                 return PTR_ERR(rtc);
 108         }
 109
 110         err = device_create_file(&plat_dev->dev, &dev_attr_irq);
 111         if (err)
 112                 dev_err(&plat_dev->dev, "Unable to create sysfs entry: %s\n",
 113                         dev_attr_irq.attr.name);
 114
 115         platform_set_drvdata(plat_dev, rtc);
 116
 117         return 0;
 118 }
 119
 120 static int test_remove(struct platform_device *plat_dev)
 121 {
 122         device_remove_file(&plat_dev->dev, &dev_attr_irq);
 123
 124         return 0;
 125 }
 126
 127 static struct platform_driver test_driver = {
 128         .probe  = test_probe,
 129         .remove = test_remove,
 130         .driver = {
 131                 .name = "rtc-test",
 132                 .owner = THIS_MODULE,
 133         },
 134 };
 135
 136 static int __init test_init(void)
 137 {
 138         int err;
 139
 140         if ((err = platform_driver_register(&test_driver)))
 141                 return err;
 142
 143         if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
 144                 err = -ENOMEM;
 145                 goto exit_driver_unregister;
 146         }
 147
 148         if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
 149                 err = -ENOMEM;
 150                 goto exit_put_test0;
 151         }
 152
 153         if ((err = platform_device_add(test0)))
 154                 goto exit_put_test1;
 155
 156         if ((err = platform_device_add(test1)))
 157                 goto exit_del_test0;
 158
 159         return 0;
 160
 161 exit_del_test0:
 162         platform_device_del(test0);
 163
 164 exit_put_test1:
 165         platform_device_put(test1);
 166
 167 exit_put_test0:
 168         platform_device_put(test0);
 169
 170 exit_driver_unregister:
 171         platform_driver_unregister(&test_driver);
 172         return err;
 173 }
 174
 175 static void __exit test_exit(void)
 176 {
 177         platform_device_unregister(test0);
 178         platform_device_unregister(test1);
 179         platform_driver_unregister(&test_driver);
 180 }
 181
 182 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 183 MODULE_DESCRIPTION("RTC test driver/device");
 184 MODULE_LICENSE("GPL");
 185
 186 module_init(test_init);
 187 module_exit(test_exit);