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_time(struct device *dev,
  38         struct rtc_time *tm)
  39 {
  40         return 0;
  41 }
  42
  43 static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
  44 {
  45         return 0;
  46 }
  47
  48 static int test_rtc_proc(struct device *dev, struct seq_file *seq)
  49 {
  50         struct platform_device *plat_dev = to_platform_device(dev);
  51
  52         seq_printf(seq, "test\t\t: yes\n");
  53         seq_printf(seq, "id\t\t: %d\n", plat_dev->id);
  54
  55         return 0;
  56 }
  57
  58 static int test_rtc_ioctl(struct device *dev, unsigned int cmd,
  59         unsigned long arg)
  60 {
  61         /* We do support interrupts, they're generated
  62          * using the sysfs interface.
  63          */
  64         switch (cmd) {
  65         case RTC_PIE_ON:
  66         case RTC_PIE_OFF:
  67         case RTC_UIE_ON:
  68         case RTC_UIE_OFF:
  69         case RTC_AIE_ON:
  70         case RTC_AIE_OFF:
  71                 return 0;
  72
  73         default:
  74                 return -ENOIOCTLCMD;
  75         }
  76 }
  77
  78 static const struct rtc_class_ops test_rtc_ops = {
  79         .proc = test_rtc_proc,
  80         .read_time = test_rtc_read_time,
  81         .set_time = test_rtc_set_time,
  82         .read_alarm = test_rtc_read_alarm,
  83         .set_alarm = test_rtc_set_alarm,
  84         .set_mmss = test_rtc_set_mmss,
  85         .ioctl = test_rtc_ioctl,
  86 };
  87
  88 static ssize_t test_irq_show(struct device *dev,
  89                                 struct device_attribute *attr, char *buf)
  90 {
  91         return sprintf(buf, "%d\n", 42);
  92 }
  93 static ssize_t test_irq_store(struct device *dev,
  94                                 struct device_attribute *attr,
  95                                 const char *buf, size_t count)
  96 {
  97         int retval;
  98         struct platform_device *plat_dev = to_platform_device(dev);
  99         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
 100
 101         retval = count;
 102         local_irq_disable();
 103         if (strncmp(buf, "tick", 4) == 0)
 104                 rtc_update_irq(&rtc->class_dev, 1, RTC_PF | RTC_IRQF);
 105         else if (strncmp(buf, "alarm", 5) == 0)
 106                 rtc_update_irq(&rtc->class_dev, 1, RTC_AF | RTC_IRQF);
 107         else if (strncmp(buf, "update", 6) == 0)
 108                 rtc_update_irq(&rtc->class_dev, 1, RTC_UF | RTC_IRQF);
 109         else
 110                 retval = -EINVAL;
 111         local_irq_enable();
 112
 113         return retval;
 114 }
 115 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
 116
 117 static int test_probe(struct platform_device *plat_dev)
 118 {
 119         int err;
 120         struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
 121                                                 &test_rtc_ops, THIS_MODULE);
 122         if (IS_ERR(rtc)) {
 123                 err = PTR_ERR(rtc);
 124                 return err;
 125         }
 126         device_create_file(&plat_dev->dev, &dev_attr_irq);
 127
 128         platform_set_drvdata(plat_dev, rtc);
 129
 130         return 0;
 131 }
 132
 133 static int __devexit test_remove(struct platform_device *plat_dev)
 134 {
 135         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
 136
 137         rtc_device_unregister(rtc);
 138         device_remove_file(&plat_dev->dev, &dev_attr_irq);
 139
 140         return 0;
 141 }
 142
 143 static struct platform_driver test_drv = {
 144         .probe  = test_probe,
 145         .remove = __devexit_p(test_remove),
 146         .driver = {
 147                 .name = "rtc-test",
 148                 .owner = THIS_MODULE,
 149         },
 150 };
 151
 152 static int __init test_init(void)
 153 {
 154         int err;
 155
 156         if ((err = platform_driver_register(&test_drv)))
 157                 return err;
 158
 159         if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
 160                 err = -ENOMEM;
 161                 goto exit_driver_unregister;
 162         }
 163
 164         if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
 165                 err = -ENOMEM;
 166                 goto exit_free_test0;
 167         }
 168
 169         if ((err = platform_device_add(test0)))
 170                 goto exit_free_test1;
 171
 172         if ((err = platform_device_add(test1)))
 173                 goto exit_device_unregister;
 174
 175         return 0;
 176
 177 exit_device_unregister:
 178         platform_device_unregister(test0);
 179
 180 exit_free_test1:
 181         platform_device_put(test1);
 182
 183 exit_free_test0:
 184         platform_device_put(test0);
 185
 186 exit_driver_unregister:
 187         platform_driver_unregister(&test_drv);
 188         return err;
 189 }
 190
 191 static void __exit test_exit(void)
 192 {
 193         platform_device_unregister(test0);
 194         platform_device_unregister(test1);
 195         platform_driver_unregister(&test_drv);
 196 }
 197
 198 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 199 MODULE_DESCRIPTION("RTC test driver/device");
 200 MODULE_LICENSE("GPL");
 201
 202 module_init(test_init);
 203 module_exit(test_exit);