Commit | Line | Data |
---|---|---|
0c86edc0 AZ |
1 | /* |
2 | * RTC subsystem, base class | |
3 | * | |
4 | * Copyright (C) 2005 Tower Technologies | |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
6 | * | |
7 | * class skeleton from drivers/hwmon/hwmon.c | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/rtc.h> | |
16 | #include <linux/kdev_t.h> | |
17 | #include <linux/idr.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
6610e089 | 19 | #include <linux/workqueue.h> |
0c86edc0 | 20 | |
5726fb20 DB |
21 | #include "rtc-core.h" |
22 | ||
23 | ||
0c86edc0 AZ |
24 | static DEFINE_IDR(rtc_idr); |
25 | static DEFINE_MUTEX(idr_lock); | |
26 | struct class *rtc_class; | |
27 | ||
cd966209 | 28 | static void rtc_device_release(struct device *dev) |
0c86edc0 | 29 | { |
cd966209 | 30 | struct rtc_device *rtc = to_rtc_device(dev); |
0c86edc0 AZ |
31 | mutex_lock(&idr_lock); |
32 | idr_remove(&rtc_idr, rtc->id); | |
33 | mutex_unlock(&idr_lock); | |
34 | kfree(rtc); | |
35 | } | |
36 | ||
7ca1d488 DB |
37 | #if defined(CONFIG_PM) && defined(CONFIG_RTC_HCTOSYS_DEVICE) |
38 | ||
39 | /* | |
40 | * On suspend(), measure the delta between one RTC and the | |
41 | * system's wall clock; restore it on resume(). | |
42 | */ | |
43 | ||
7ca1d488 | 44 | static time_t oldtime; |
304529b1 | 45 | static struct timespec oldts; |
7ca1d488 DB |
46 | |
47 | static int rtc_suspend(struct device *dev, pm_message_t mesg) | |
48 | { | |
49 | struct rtc_device *rtc = to_rtc_device(dev); | |
50 | struct rtc_time tm; | |
51 | ||
d4afc76c | 52 | if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0) |
7ca1d488 DB |
53 | return 0; |
54 | ||
55 | rtc_read_time(rtc, &tm); | |
304529b1 | 56 | ktime_get_ts(&oldts); |
7ca1d488 DB |
57 | rtc_tm_to_time(&tm, &oldtime); |
58 | ||
7ca1d488 DB |
59 | return 0; |
60 | } | |
61 | ||
62 | static int rtc_resume(struct device *dev) | |
63 | { | |
64 | struct rtc_device *rtc = to_rtc_device(dev); | |
65 | struct rtc_time tm; | |
66 | time_t newtime; | |
67 | struct timespec time; | |
304529b1 | 68 | struct timespec newts; |
7ca1d488 | 69 | |
d4afc76c | 70 | if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0) |
7ca1d488 DB |
71 | return 0; |
72 | ||
304529b1 | 73 | ktime_get_ts(&newts); |
7ca1d488 DB |
74 | rtc_read_time(rtc, &tm); |
75 | if (rtc_valid_tm(&tm) != 0) { | |
d4afc76c | 76 | pr_debug("%s: bogus resume time\n", dev_name(&rtc->dev)); |
7ca1d488 DB |
77 | return 0; |
78 | } | |
79 | rtc_tm_to_time(&tm, &newtime); | |
80 | if (newtime <= oldtime) { | |
81 | if (newtime < oldtime) | |
d4afc76c | 82 | pr_debug("%s: time travel!\n", dev_name(&rtc->dev)); |
7ca1d488 DB |
83 | return 0; |
84 | } | |
304529b1 JS |
85 | /* calculate the RTC time delta */ |
86 | set_normalized_timespec(&time, newtime - oldtime, 0); | |
7ca1d488 | 87 | |
304529b1 JS |
88 | /* subtract kernel time between rtc_suspend to rtc_resume */ |
89 | time = timespec_sub(time, timespec_sub(newts, oldts)); | |
7ca1d488 | 90 | |
304529b1 | 91 | timekeeping_inject_sleeptime(&time); |
7ca1d488 DB |
92 | return 0; |
93 | } | |
94 | ||
95 | #else | |
96 | #define rtc_suspend NULL | |
97 | #define rtc_resume NULL | |
98 | #endif | |
99 | ||
100 | ||
0c86edc0 AZ |
101 | /** |
102 | * rtc_device_register - register w/ RTC class | |
103 | * @dev: the device to register | |
104 | * | |
105 | * rtc_device_unregister() must be called when the class device is no | |
106 | * longer needed. | |
107 | * | |
108 | * Returns the pointer to the new struct class device. | |
109 | */ | |
110 | struct rtc_device *rtc_device_register(const char *name, struct device *dev, | |
ff8371ac | 111 | const struct rtc_class_ops *ops, |
0c86edc0 AZ |
112 | struct module *owner) |
113 | { | |
114 | struct rtc_device *rtc; | |
f44f7f96 | 115 | struct rtc_wkalrm alrm; |
0c86edc0 AZ |
116 | int id, err; |
117 | ||
118 | if (idr_pre_get(&rtc_idr, GFP_KERNEL) == 0) { | |
119 | err = -ENOMEM; | |
120 | goto exit; | |
121 | } | |
122 | ||
123 | ||
124 | mutex_lock(&idr_lock); | |
125 | err = idr_get_new(&rtc_idr, NULL, &id); | |
126 | mutex_unlock(&idr_lock); | |
127 | ||
128 | if (err < 0) | |
129 | goto exit; | |
130 | ||
131 | id = id & MAX_ID_MASK; | |
132 | ||
133 | rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL); | |
134 | if (rtc == NULL) { | |
135 | err = -ENOMEM; | |
136 | goto exit_idr; | |
137 | } | |
138 | ||
139 | rtc->id = id; | |
140 | rtc->ops = ops; | |
141 | rtc->owner = owner; | |
83a06bf5 | 142 | rtc->irq_freq = 1; |
110d693d | 143 | rtc->max_user_freq = 64; |
cd966209 DB |
144 | rtc->dev.parent = dev; |
145 | rtc->dev.class = rtc_class; | |
146 | rtc->dev.release = rtc_device_release; | |
0c86edc0 AZ |
147 | |
148 | mutex_init(&rtc->ops_lock); | |
149 | spin_lock_init(&rtc->irq_lock); | |
150 | spin_lock_init(&rtc->irq_task_lock); | |
d691eb90 | 151 | init_waitqueue_head(&rtc->irq_queue); |
0c86edc0 | 152 | |
6610e089 JS |
153 | /* Init timerqueue */ |
154 | timerqueue_init_head(&rtc->timerqueue); | |
96c8f06a | 155 | INIT_WORK(&rtc->irqwork, rtc_timer_do_work); |
6610e089 | 156 | /* Init aie timer */ |
96c8f06a | 157 | rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc); |
6610e089 | 158 | /* Init uie timer */ |
96c8f06a | 159 | rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc); |
6610e089 JS |
160 | /* Init pie timer */ |
161 | hrtimer_init(&rtc->pie_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
162 | rtc->pie_timer.function = rtc_pie_update_irq; | |
163 | rtc->pie_enabled = 0; | |
164 | ||
f44f7f96 JS |
165 | /* Check to see if there is an ALARM already set in hw */ |
166 | err = __rtc_read_alarm(rtc, &alrm); | |
167 | ||
168 | if (!err && !rtc_valid_tm(&alrm.time)) | |
f6d5b331 | 169 | rtc_initialize_alarm(rtc, &alrm); |
f44f7f96 | 170 | |
0c86edc0 | 171 | strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE); |
d4afc76c | 172 | dev_set_name(&rtc->dev, "rtc%d", id); |
0c86edc0 | 173 | |
cb3a58d2 DB |
174 | rtc_dev_prepare(rtc); |
175 | ||
cd966209 | 176 | err = device_register(&rtc->dev); |
59cca865 VK |
177 | if (err) { |
178 | put_device(&rtc->dev); | |
0c86edc0 | 179 | goto exit_kfree; |
59cca865 | 180 | } |
0c86edc0 | 181 | |
5726fb20 | 182 | rtc_dev_add_device(rtc); |
446ecbd9 | 183 | rtc_sysfs_add_device(rtc); |
7d9f99ec | 184 | rtc_proc_add_device(rtc); |
5726fb20 | 185 | |
0c86edc0 | 186 | dev_info(dev, "rtc core: registered %s as %s\n", |
d4afc76c | 187 | rtc->name, dev_name(&rtc->dev)); |
0c86edc0 AZ |
188 | |
189 | return rtc; | |
190 | ||
191 | exit_kfree: | |
192 | kfree(rtc); | |
193 | ||
194 | exit_idr: | |
6ac12dfe | 195 | mutex_lock(&idr_lock); |
0c86edc0 | 196 | idr_remove(&rtc_idr, id); |
6ac12dfe | 197 | mutex_unlock(&idr_lock); |
0c86edc0 AZ |
198 | |
199 | exit: | |
d1d65b77 AZ |
200 | dev_err(dev, "rtc core: unable to register %s, err = %d\n", |
201 | name, err); | |
0c86edc0 AZ |
202 | return ERR_PTR(err); |
203 | } | |
204 | EXPORT_SYMBOL_GPL(rtc_device_register); | |
205 | ||
206 | ||
207 | /** | |
208 | * rtc_device_unregister - removes the previously registered RTC class device | |
209 | * | |
210 | * @rtc: the RTC class device to destroy | |
211 | */ | |
212 | void rtc_device_unregister(struct rtc_device *rtc) | |
213 | { | |
cd966209 | 214 | if (get_device(&rtc->dev) != NULL) { |
e109ebd1 DB |
215 | mutex_lock(&rtc->ops_lock); |
216 | /* remove innards of this RTC, then disable it, before | |
217 | * letting any rtc_class_open() users access it again | |
218 | */ | |
446ecbd9 | 219 | rtc_sysfs_del_device(rtc); |
5726fb20 | 220 | rtc_dev_del_device(rtc); |
7d9f99ec | 221 | rtc_proc_del_device(rtc); |
cd966209 | 222 | device_unregister(&rtc->dev); |
e109ebd1 DB |
223 | rtc->ops = NULL; |
224 | mutex_unlock(&rtc->ops_lock); | |
cd966209 | 225 | put_device(&rtc->dev); |
e109ebd1 | 226 | } |
0c86edc0 AZ |
227 | } |
228 | EXPORT_SYMBOL_GPL(rtc_device_unregister); | |
229 | ||
0c86edc0 AZ |
230 | static int __init rtc_init(void) |
231 | { | |
232 | rtc_class = class_create(THIS_MODULE, "rtc"); | |
233 | if (IS_ERR(rtc_class)) { | |
234 | printk(KERN_ERR "%s: couldn't create class\n", __FILE__); | |
235 | return PTR_ERR(rtc_class); | |
236 | } | |
7ca1d488 DB |
237 | rtc_class->suspend = rtc_suspend; |
238 | rtc_class->resume = rtc_resume; | |
5726fb20 | 239 | rtc_dev_init(); |
446ecbd9 | 240 | rtc_sysfs_init(rtc_class); |
0c86edc0 AZ |
241 | return 0; |
242 | } | |
243 | ||
244 | static void __exit rtc_exit(void) | |
245 | { | |
5726fb20 | 246 | rtc_dev_exit(); |
0c86edc0 | 247 | class_destroy(rtc_class); |
2a7a06a0 | 248 | idr_destroy(&rtc_idr); |
0c86edc0 AZ |
249 | } |
250 | ||
818a8674 | 251 | subsys_initcall(rtc_init); |
0c86edc0 AZ |
252 | module_exit(rtc_exit); |
253 | ||
818a8674 | 254 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); |
0c86edc0 AZ |
255 | MODULE_DESCRIPTION("RTC class support"); |
256 | MODULE_LICENSE("GPL"); |