xref: /linux/drivers/rtc/rtc-test.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
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 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 	if (strncmp(buf, "tick", 4) == 0)
103 		rtc_update_irq(&rtc->class_dev, 1, RTC_PF | RTC_IRQF);
104 	else if (strncmp(buf, "alarm", 5) == 0)
105 		rtc_update_irq(&rtc->class_dev, 1, RTC_AF | RTC_IRQF);
106 	else if (strncmp(buf, "update", 6) == 0)
107 		rtc_update_irq(&rtc->class_dev, 1, RTC_UF | RTC_IRQF);
108 	else
109 		retval = -EINVAL;
110 
111 	return retval;
112 }
113 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
114 
115 static int test_probe(struct platform_device *plat_dev)
116 {
117 	int err;
118 	struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
119 						&test_rtc_ops, THIS_MODULE);
120 	if (IS_ERR(rtc)) {
121 		err = PTR_ERR(rtc);
122 		return err;
123 	}
124 	device_create_file(&plat_dev->dev, &dev_attr_irq);
125 
126 	platform_set_drvdata(plat_dev, rtc);
127 
128 	return 0;
129 }
130 
131 static int __devexit test_remove(struct platform_device *plat_dev)
132 {
133 	struct rtc_device *rtc = platform_get_drvdata(plat_dev);
134 
135 	rtc_device_unregister(rtc);
136 	device_remove_file(&plat_dev->dev, &dev_attr_irq);
137 
138 	return 0;
139 }
140 
141 static struct platform_driver test_drv = {
142 	.probe	= test_probe,
143 	.remove = __devexit_p(test_remove),
144 	.driver = {
145 		.name = "rtc-test",
146 		.owner = THIS_MODULE,
147 	},
148 };
149 
150 static int __init test_init(void)
151 {
152 	int err;
153 
154 	if ((err = platform_driver_register(&test_drv)))
155 		return err;
156 
157 	if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
158 		err = -ENOMEM;
159 		goto exit_driver_unregister;
160 	}
161 
162 	if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
163 		err = -ENOMEM;
164 		goto exit_free_test0;
165 	}
166 
167 	if ((err = platform_device_add(test0)))
168 		goto exit_free_test1;
169 
170 	if ((err = platform_device_add(test1)))
171 		goto exit_device_unregister;
172 
173 	return 0;
174 
175 exit_device_unregister:
176 	platform_device_unregister(test0);
177 
178 exit_free_test1:
179 	platform_device_put(test1);
180 
181 exit_free_test0:
182 	platform_device_put(test0);
183 
184 exit_driver_unregister:
185 	platform_driver_unregister(&test_drv);
186 	return err;
187 }
188 
189 static void __exit test_exit(void)
190 {
191 	platform_device_unregister(test0);
192 	platform_device_unregister(test1);
193 	platform_driver_unregister(&test_drv);
194 }
195 
196 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
197 MODULE_DESCRIPTION("RTC test driver/device");
198 MODULE_LICENSE("GPL");
199 
200 module_init(test_init);
201 module_exit(test_exit);
202