Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * An RTC test device/driver
4 * Copyright (C) 2005 Tower Technologies
5 * Author: Alessandro Zummo <a.zummo@towertech.it>
6 */
7
8#include <linux/module.h>
9#include <linux/err.h>
10#include <linux/rtc.h>
11#include <linux/platform_device.h>
12
13#define MAX_RTC_TEST 3
14
15struct rtc_test_data {
16 struct rtc_device *rtc;
17 time64_t offset;
18 struct timer_list alarm;
19 bool alarm_en;
20};
21
22static struct platform_device *pdev[MAX_RTC_TEST];
23
24static int test_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
25{
26 struct rtc_test_data *rtd = dev_get_drvdata(dev);
27 time64_t alarm;
28
29 alarm = (rtd->alarm.expires - jiffies) / HZ;
30 alarm += ktime_get_real_seconds() + rtd->offset;
31
32 rtc_time64_to_tm(alarm, &alrm->time);
33 alrm->enabled = rtd->alarm_en;
34
35 return 0;
36}
37
38static int test_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
39{
40 struct rtc_test_data *rtd = dev_get_drvdata(dev);
41 ktime_t timeout;
42 u64 expires;
43
44 timeout = rtc_tm_to_time64(&alrm->time) - ktime_get_real_seconds();
45 timeout -= rtd->offset;
46
47 del_timer(&rtd->alarm);
48
49 expires = jiffies + timeout * HZ;
50 if (expires > U32_MAX)
51 expires = U32_MAX;
52
53 pr_err("ABE: %s +%d %s\n", __FILE__, __LINE__, __func__);
54 rtd->alarm.expires = expires;
55
56 if (alrm->enabled)
57 add_timer(&rtd->alarm);
58
59 rtd->alarm_en = alrm->enabled;
60
61 return 0;
62}
63
64static int test_rtc_read_time(struct device *dev, struct rtc_time *tm)
65{
66 struct rtc_test_data *rtd = dev_get_drvdata(dev);
67
68 rtc_time64_to_tm(ktime_get_real_seconds() + rtd->offset, tm);
69
70 return 0;
71}
72
73static int test_rtc_set_time(struct device *dev, struct rtc_time *tm)
74{
75 struct rtc_test_data *rtd = dev_get_drvdata(dev);
76
77 rtd->offset = rtc_tm_to_time64(tm) - ktime_get_real_seconds();
78
79 return 0;
80}
81
82static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
83{
84 struct rtc_test_data *rtd = dev_get_drvdata(dev);
85
86 rtd->alarm_en = enable;
87 if (enable)
88 add_timer(&rtd->alarm);
89 else
90 del_timer(&rtd->alarm);
91
92 return 0;
93}
94
95static const struct rtc_class_ops test_rtc_ops_noalm = {
96 .read_time = test_rtc_read_time,
97 .set_time = test_rtc_set_time,
98 .alarm_irq_enable = test_rtc_alarm_irq_enable,
99};
100
101static const struct rtc_class_ops test_rtc_ops = {
102 .read_time = test_rtc_read_time,
103 .set_time = test_rtc_set_time,
104 .read_alarm = test_rtc_read_alarm,
105 .set_alarm = test_rtc_set_alarm,
106 .alarm_irq_enable = test_rtc_alarm_irq_enable,
107};
108
109static void test_rtc_alarm_handler(struct timer_list *t)
110{
111 struct rtc_test_data *rtd = from_timer(rtd, t, alarm);
112
113 rtc_update_irq(rtd->rtc, 1, RTC_AF | RTC_IRQF);
114}
115
116static int test_probe(struct platform_device *plat_dev)
117{
118 struct rtc_test_data *rtd;
119
120 rtd = devm_kzalloc(&plat_dev->dev, sizeof(*rtd), GFP_KERNEL);
121 if (!rtd)
122 return -ENOMEM;
123
124 platform_set_drvdata(plat_dev, rtd);
125
126 rtd->rtc = devm_rtc_allocate_device(&plat_dev->dev);
127 if (IS_ERR(rtd->rtc))
128 return PTR_ERR(rtd->rtc);
129
130 switch (plat_dev->id) {
131 case 0:
132 rtd->rtc->ops = &test_rtc_ops_noalm;
133 break;
134 default:
135 rtd->rtc->ops = &test_rtc_ops;
136 }
137
138 timer_setup(&rtd->alarm, test_rtc_alarm_handler, 0);
139 rtd->alarm.expires = 0;
140
141 return rtc_register_device(rtd->rtc);
142}
143
144static struct platform_driver test_driver = {
145 .probe = test_probe,
146 .driver = {
147 .name = "rtc-test",
148 },
149};
150
151static int __init test_init(void)
152{
153 int i, err;
154
155 err = platform_driver_register(&test_driver);
156 if (err)
157 return err;
158
159 err = -ENOMEM;
160 for (i = 0; i < MAX_RTC_TEST; i++) {
161 pdev[i] = platform_device_alloc("rtc-test", i);
162 if (!pdev[i])
163 goto exit_free_mem;
164 }
165
166 for (i = 0; i < MAX_RTC_TEST; i++) {
167 err = platform_device_add(pdev[i]);
168 if (err)
169 goto exit_device_del;
170 }
171
172 return 0;
173
174exit_device_del:
175 for (; i > 0; i--)
176 platform_device_del(pdev[i - 1]);
177
178exit_free_mem:
179 for (i = 0; i < MAX_RTC_TEST; i++)
180 platform_device_put(pdev[i]);
181
182 platform_driver_unregister(&test_driver);
183 return err;
184}
185
186static void __exit test_exit(void)
187{
188 int i;
189
190 for (i = 0; i < MAX_RTC_TEST; i++)
191 platform_device_unregister(pdev[i]);
192
193 platform_driver_unregister(&test_driver);
194}
195
196MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
197MODULE_DESCRIPTION("RTC test driver/device");
198MODULE_LICENSE("GPL v2");
199
200module_init(test_init);
201module_exit(test_exit);