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
test_rtc_read_alarm(struct device * dev,struct rtc_wkalrm * alrm)18 static int test_rtc_read_alarm(struct device *dev,
19 struct rtc_wkalrm *alrm)
20 {
21 return 0;
22 }
23
test_rtc_set_alarm(struct device * dev,struct rtc_wkalrm * alrm)24 static int test_rtc_set_alarm(struct device *dev,
25 struct rtc_wkalrm *alrm)
26 {
27 return 0;
28 }
29
test_rtc_read_time(struct device * dev,struct rtc_time * tm)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
test_rtc_set_mmss(struct device * dev,unsigned long secs)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
test_rtc_proc(struct device * dev,struct seq_file * seq)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
test_rtc_alarm_irq_enable(struct device * dev,unsigned int enable)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
test_irq_show(struct device * dev,struct device_attribute * attr,char * buf)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 }
test_irq_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
test_probe(struct platform_device * plat_dev)99 static int test_probe(struct platform_device *plat_dev)
100 {
101 int err;
102 struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
103 &test_rtc_ops, THIS_MODULE);
104 if (IS_ERR(rtc)) {
105 err = PTR_ERR(rtc);
106 return err;
107 }
108
109 err = device_create_file(&plat_dev->dev, &dev_attr_irq);
110 if (err)
111 goto err;
112
113 platform_set_drvdata(plat_dev, rtc);
114
115 return 0;
116
117 err:
118 rtc_device_unregister(rtc);
119 return err;
120 }
121
test_remove(struct platform_device * plat_dev)122 static int __devexit test_remove(struct platform_device *plat_dev)
123 {
124 struct rtc_device *rtc = platform_get_drvdata(plat_dev);
125
126 rtc_device_unregister(rtc);
127 device_remove_file(&plat_dev->dev, &dev_attr_irq);
128
129 return 0;
130 }
131
132 static struct platform_driver test_driver = {
133 .probe = test_probe,
134 .remove = __devexit_p(test_remove),
135 .driver = {
136 .name = "rtc-test",
137 .owner = THIS_MODULE,
138 },
139 };
140
test_init(void)141 static int __init test_init(void)
142 {
143 int err;
144
145 if ((err = platform_driver_register(&test_driver)))
146 return err;
147
148 if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
149 err = -ENOMEM;
150 goto exit_driver_unregister;
151 }
152
153 if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
154 err = -ENOMEM;
155 goto exit_free_test0;
156 }
157
158 if ((err = platform_device_add(test0)))
159 goto exit_free_test1;
160
161 if ((err = platform_device_add(test1)))
162 goto exit_device_unregister;
163
164 return 0;
165
166 exit_device_unregister:
167 platform_device_unregister(test0);
168
169 exit_free_test1:
170 platform_device_put(test1);
171
172 exit_free_test0:
173 platform_device_put(test0);
174
175 exit_driver_unregister:
176 platform_driver_unregister(&test_driver);
177 return err;
178 }
179
test_exit(void)180 static void __exit test_exit(void)
181 {
182 platform_device_unregister(test0);
183 platform_device_unregister(test1);
184 platform_driver_unregister(&test_driver);
185 }
186
187 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
188 MODULE_DESCRIPTION("RTC test driver/device");
189 MODULE_LICENSE("GPL");
190
191 module_init(test_init);
192 module_exit(test_exit);
193