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Linux/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);
188 

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