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         if (strncmp(buf, "tick", 4) == 0)
  97                 rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
  98         else if (strncmp(buf, "alarm", 5) == 0)
  99                 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
 100         else if (strncmp(buf, "update", 6) == 0)
 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 = rtc_device_register("test", &plat_dev->dev,
 113                                                 &test_rtc_ops, THIS_MODULE);
 114         if (IS_ERR(rtc)) {
 115                 err = PTR_ERR(rtc);
 116                 return err;
 117         }
 118
 119         err = device_create_file(&plat_dev->dev, &dev_attr_irq);
 120         if (err)
 121                 goto err;
 122
 123         platform_set_drvdata(plat_dev, rtc);
 124
 125         return 0;
 126
 127 err:
 128         rtc_device_unregister(rtc);
 129         return err;
 130 }
 131
 132 static int __devexit test_remove(struct platform_device *plat_dev)
 133 {
 134         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
 135
 136         rtc_device_unregister(rtc);
 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 = __devexit_p(test_remove),
 145         .driver = {
 146                 .name = "rtc-test",
 147                 .owner = THIS_MODULE,
 148         },
 149 };
 150
 151 static int __init test_init(void)
 152 {
 153         int err;
 154
 155         if ((err = platform_driver_register(&test_driver)))
 156                 return err;
 157
 158         if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
 159                 err = -ENOMEM;
 160                 goto exit_driver_unregister;
 161         }
 162
 163         if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
 164                 err = -ENOMEM;
 165                 goto exit_free_test0;
 166         }
 167
 168         if ((err = platform_device_add(test0)))
 169                 goto exit_free_test1;
 170
 171         if ((err = platform_device_add(test1)))
 172                 goto exit_device_unregister;
 173
 174         return 0;
 175
 176 exit_device_unregister:
 177         platform_device_unregister(test0);
 178
 179 exit_free_test1:
 180         platform_device_put(test1);
 181
 182 exit_free_test0:
 183         platform_device_put(test0);
 184
 185 exit_driver_unregister:
 186         platform_driver_unregister(&test_driver);
 187         return err;
 188 }
 189
 190 static void __exit test_exit(void)
 191 {
 192         platform_device_unregister(test0);
 193         platform_device_unregister(test1);
 194         platform_driver_unregister(&test_driver);
 195 }
 196
 197 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 198 MODULE_DESCRIPTION("RTC test driver/device");
 199 MODULE_LICENSE("GPL");
 200
 201 module_init(test_init);
 202 module_exit(test_exit);