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 int test_mmss64;
  17 module_param(test_mmss64, int, 0644);
  18 MODULE_PARM_DESC(test_mmss64, "Test struct rtc_class_ops.set_mmss64().");
  19
  20 static struct platform_device *test0 = NULL, *test1 = NULL;
  21
  22 static int test_rtc_read_alarm(struct device *dev,
  23         struct rtc_wkalrm *alrm)
  24 {
  25         return 0;
  26 }
  27
  28 static int test_rtc_set_alarm(struct device *dev,
  29         struct rtc_wkalrm *alrm)
  30 {
  31         return 0;
  32 }
  33
  34 static int test_rtc_read_time(struct device *dev,
  35         struct rtc_time *tm)
  36 {
  37         rtc_time64_to_tm(ktime_get_real_seconds(), tm);
  38         return 0;
  39 }
  40
  41 static int test_rtc_set_mmss64(struct device *dev, time64_t secs)
  42 {
  43         dev_info(dev, "%s, secs = %lld\n", __func__, (long long)secs);
  44         return 0;
  45 }
  46
  47 static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
  48 {
  49         dev_info(dev, "%s, secs = %lu\n", __func__, secs);
  50         return 0;
  51 }
  52
  53 static int test_rtc_proc(struct device *dev, struct seq_file *seq)
  54 {
  55         struct platform_device *plat_dev = to_platform_device(dev);
  56
  57         seq_printf(seq, "test\t\t: yes\n");
  58         seq_printf(seq, "id\t\t: %d\n", plat_dev->id);
  59
  60         return 0;
  61 }
  62
  63 static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
  64 {
  65         return 0;
  66 }
  67
  68 static struct rtc_class_ops test_rtc_ops = {
  69         .proc = test_rtc_proc,
  70         .read_time = test_rtc_read_time,
  71         .read_alarm = test_rtc_read_alarm,
  72         .set_alarm = test_rtc_set_alarm,
  73         .set_mmss = test_rtc_set_mmss,
  74         .alarm_irq_enable = test_rtc_alarm_irq_enable,
  75 };
  76
  77 static ssize_t test_irq_show(struct device *dev,
  78                                 struct device_attribute *attr, char *buf)
  79 {
  80         return sprintf(buf, "%d\n", 42);
  81 }
  82 static ssize_t test_irq_store(struct device *dev,
  83                                 struct device_attribute *attr,
  84                                 const char *buf, size_t count)
  85 {
  86         int retval;
  87         struct platform_device *plat_dev = to_platform_device(dev);
  88         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
  89
  90         retval = count;
  91         if (strncmp(buf, "tick", 4) == 0 && rtc->pie_enabled)
  92                 rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
  93         else if (strncmp(buf, "alarm", 5) == 0) {
  94                 struct rtc_wkalrm alrm;
  95                 int err = rtc_read_alarm(rtc, &alrm);
  96
  97                 if (!err && alrm.enabled)
  98                         rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
  99
 100         } else if (strncmp(buf, "update", 6) == 0 && rtc->uie_rtctimer.enabled)
 101                 rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
 102         else
 103                 retval = -EINVAL;
 104
 105         return retval;
 106 }
 107 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
 108
 109 static int test_probe(struct platform_device *plat_dev)
 110 {
 111         int err;
 112         struct rtc_device *rtc;
 113
 114         if (test_mmss64) {
 115                 test_rtc_ops.set_mmss64 = test_rtc_set_mmss64;
 116                 test_rtc_ops.set_mmss = NULL;
 117         }
 118
 119         rtc = devm_rtc_device_register(&plat_dev->dev, "test",
 120                                 &test_rtc_ops, THIS_MODULE);
 121         if (IS_ERR(rtc)) {
 122                 return PTR_ERR(rtc);
 123         }
 124
 125         err = device_create_file(&plat_dev->dev, &dev_attr_irq);
 126         if (err)
 127                 dev_err(&plat_dev->dev, "Unable to create sysfs entry: %s\n",
 128                         dev_attr_irq.attr.name);
 129
 130         platform_set_drvdata(plat_dev, rtc);
 131
 132         return 0;
 133 }
 134
 135 static int test_remove(struct platform_device *plat_dev)
 136 {
 137         device_remove_file(&plat_dev->dev, &dev_attr_irq);
 138
 139         return 0;
 140 }
 141
 142 static struct platform_driver test_driver = {
 143         .probe  = test_probe,
 144         .remove = test_remove,
 145         .driver = {
 146                 .name = "rtc-test",
 147         },
 148 };
 149
 150 static int __init test_init(void)
 151 {
 152         int err;
 153
 154         if ((err = platform_driver_register(&test_driver)))
 155                 return err;
 156
 157         if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
 158                 err = -ENOMEM;
 159                 goto exit_driver_unregister;
 160         }
 161
 162         if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
 163                 err = -ENOMEM;
 164                 goto exit_put_test0;
 165         }
 166
 167         if ((err = platform_device_add(test0)))
 168                 goto exit_put_test1;
 169
 170         if ((err = platform_device_add(test1)))
 171                 goto exit_del_test0;
 172
 173         return 0;
 174
 175 exit_del_test0:
 176         platform_device_del(test0);
 177
 178 exit_put_test1:
 179         platform_device_put(test1);
 180
 181 exit_put_test0:
 182         platform_device_put(test0);
 183
 184 exit_driver_unregister:
 185         platform_driver_unregister(&test_driver);
 186         return err;
 187 }
 188
 189 static void __exit test_exit(void)
 190 {
 191         platform_device_unregister(test0);
 192         platform_device_unregister(test1);
 193         platform_driver_unregister(&test_driver);
 194 }
 195
 196 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 197 MODULE_DESCRIPTION("RTC test driver/device");
 198 MODULE_LICENSE("GPL");
 199
 200 module_init(test_init);
 201 module_exit(test_exit);