Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
16static struct platform_device *test0 = NULL, *test1 = NULL;
17
18static int test_rtc_read_alarm(struct device *dev,
19 struct rtc_wkalrm *alrm)
20{
21 return 0;
22}
23
24static int test_rtc_set_alarm(struct device *dev,
25 struct rtc_wkalrm *alrm)
26{
27 return 0;
28}
29
30static 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
37static 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
43static 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
53static 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
73static 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
82static ssize_t test_irq_show(struct device *dev,
83 struct device_attribute *attr, char *buf)
84{
85 return sprintf(buf, "%d\n", 42);
86}
87static 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}
107static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
108
109static 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
127err:
128 rtc_device_unregister(rtc);
129 return err;
130}
131
132static 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
142static 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
151static 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
176exit_device_unregister:
177 platform_device_unregister(test0);
178
179exit_free_test1:
180 platform_device_put(test1);
181
182exit_free_test0:
183 platform_device_put(test0);
184
185exit_driver_unregister:
186 platform_driver_unregister(&test_driver);
187 return err;
188}
189
190static void __exit test_exit(void)
191{
192 platform_device_unregister(test0);
193 platform_device_unregister(test1);
194 platform_driver_unregister(&test_driver);
195}
196
197MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
198MODULE_DESCRIPTION("RTC test driver/device");
199MODULE_LICENSE("GPL");
200
201module_init(test_init);
202module_exit(test_exit);