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_ioctl(struct device *dev, unsigned int cmd,
  54         unsigned long arg)
  55 {
  56         /* We do support interrupts, they're generated
  57          * using the sysfs interface.
  58          */
  59         switch (cmd) {
  60         case RTC_PIE_ON:
  61         case RTC_PIE_OFF:
  62         case RTC_UIE_ON:
  63         case RTC_UIE_OFF:
  64         case RTC_AIE_ON:
  65         case RTC_AIE_OFF:
  66                 return 0;
  67
  68         default:
  69                 return -ENOIOCTLCMD;
  70         }
  71 }
  72
  73 static const struct rtc_class_ops test_rtc_ops = {
  74         .proc = test_rtc_proc,
  75         .read_time = test_rtc_read_time,
  76         .read_alarm = test_rtc_read_alarm,
  77         .set_alarm = test_rtc_set_alarm,
  78         .set_mmss = test_rtc_set_mmss,
  79         .ioctl = test_rtc_ioctl,
  80 };
  81
  82 static ssize_t test_irq_show(struct device *dev,
  83                                 struct device_attribute *attr, char *buf)
  84 {
  85         return sprintf(buf, "%d\n", 42);
  86 }
  87 static ssize_t test_irq_store(struct device *dev,
  88                                 struct device_attribute *attr,
  89                                 const char *buf, size_t count)
  90 {
  91         int retval;
  92         struct platform_device *plat_dev = to_platform_device(dev);
  93         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
  94
  95         retval = count;
  96         local_irq_disable();
  97         if (strncmp(buf, "tick", 4) == 0)
  98                 rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
  99         else if (strncmp(buf, "alarm", 5) == 0)
 100                 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
 101         else if (strncmp(buf, "update", 6) == 0)
 102                 rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
 103         else
 104                 retval = -EINVAL;
 105         local_irq_enable();
 106
 107         return retval;
 108 }
 109 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
 110
 111 static int test_probe(struct platform_device *plat_dev)
 112 {
 113         int err;
 114         struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
 115                                                 &test_rtc_ops, THIS_MODULE);
 116         if (IS_ERR(rtc)) {
 117                 err = PTR_ERR(rtc);
 118                 return err;
 119         }
 120
 121         err = device_create_file(&plat_dev->dev, &dev_attr_irq);
 122         if (err)
 123                 goto err;
 124
 125         platform_set_drvdata(plat_dev, rtc);
 126
 127         return 0;
 128
 129 err:
 130         rtc_device_unregister(rtc);
 131         return err;
 132 }
 133
 134 static int __devexit test_remove(struct platform_device *plat_dev)
 135 {
 136         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
 137
 138         rtc_device_unregister(rtc);
 139         device_remove_file(&plat_dev->dev, &dev_attr_irq);
 140
 141         return 0;
 142 }
 143
 144 static struct platform_driver test_driver = {
 145         .probe  = test_probe,
 146         .remove = __devexit_p(test_remove),
 147         .driver = {
 148                 .name = "rtc-test",
 149                 .owner = THIS_MODULE,
 150         },
 151 };
 152
 153 static int __init test_init(void)
 154 {
 155         int err;
 156
 157         if ((err = platform_driver_register(&test_driver)))
 158                 return err;
 159
 160         if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
 161                 err = -ENOMEM;
 162                 goto exit_driver_unregister;
 163         }
 164
 165         if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
 166                 err = -ENOMEM;
 167                 goto exit_free_test0;
 168         }
 169
 170         if ((err = platform_device_add(test0)))
 171                 goto exit_free_test1;
 172
 173         if ((err = platform_device_add(test1)))
 174                 goto exit_device_unregister;
 175
 176         return 0;
 177
 178 exit_device_unregister:
 179         platform_device_unregister(test0);
 180
 181 exit_free_test1:
 182         platform_device_put(test1);
 183
 184 exit_free_test0:
 185         platform_device_put(test0);
 186
 187 exit_driver_unregister:
 188         platform_driver_unregister(&test_driver);
 189         return err;
 190 }
 191
 192 static void __exit test_exit(void)
 193 {
 194         platform_device_unregister(test0);
 195         platform_device_unregister(test1);
 196         platform_driver_unregister(&test_driver);
 197 }
 198
 199 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 200 MODULE_DESCRIPTION("RTC test driver/device");
 201 MODULE_LICENSE("GPL");
 202
 203 module_init(test_init);
 204 module_exit(test_exit);