91a43c970b2183a15281e5ce020a973d7fdb2a82
[linux-2.6.git] / drivers / rtc / rtc-proc.c
1 /*
2  * RTC subsystem, proc interface
3  *
4  * Copyright (C) 2005-06 Tower Technologies
5  * Author: Alessandro Zummo <a.zummo@towertech.it>
6  *
7  * based on arch/arm/common/rtctime.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/proc_fs.h>
17 #include <linux/seq_file.h>
18
19 static struct class_device *rtc_dev = NULL;
20 static DEFINE_MUTEX(rtc_lock);
21
22 static int rtc_proc_show(struct seq_file *seq, void *offset)
23 {
24         int err;
25         struct class_device *class_dev = seq->private;
26         const struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
27         struct rtc_wkalrm alrm;
28         struct rtc_time tm;
29
30         err = rtc_read_time(class_dev, &tm);
31         if (err == 0) {
32                 seq_printf(seq,
33                         "rtc_time\t: %02d:%02d:%02d\n"
34                         "rtc_date\t: %04d-%02d-%02d\n",
35                         tm.tm_hour, tm.tm_min, tm.tm_sec,
36                         tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
37         }
38
39         err = rtc_read_alarm(class_dev, &alrm);
40         if (err == 0) {
41                 seq_printf(seq, "alrm_time\t: ");
42                 if ((unsigned int)alrm.time.tm_hour <= 24)
43                         seq_printf(seq, "%02d:", alrm.time.tm_hour);
44                 else
45                         seq_printf(seq, "**:");
46                 if ((unsigned int)alrm.time.tm_min <= 59)
47                         seq_printf(seq, "%02d:", alrm.time.tm_min);
48                 else
49                         seq_printf(seq, "**:");
50                 if ((unsigned int)alrm.time.tm_sec <= 59)
51                         seq_printf(seq, "%02d\n", alrm.time.tm_sec);
52                 else
53                         seq_printf(seq, "**\n");
54
55                 seq_printf(seq, "alrm_date\t: ");
56                 if ((unsigned int)alrm.time.tm_year <= 200)
57                         seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
58                 else
59                         seq_printf(seq, "****-");
60                 if ((unsigned int)alrm.time.tm_mon <= 11)
61                         seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
62                 else
63                         seq_printf(seq, "**-");
64                 if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
65                         seq_printf(seq, "%02d\n", alrm.time.tm_mday);
66                 else
67                         seq_printf(seq, "**\n");
68                 seq_printf(seq, "alrm_wakeup\t: %s\n",
69                                 alrm.enabled ? "yes" : "no");
70                 seq_printf(seq, "alrm_pending\t: %s\n",
71                                 alrm.pending ? "yes" : "no");
72         }
73
74         seq_printf(seq, "24hr\t\t: yes\n");
75
76         if (ops->proc)
77                 ops->proc(class_dev->dev, seq);
78
79         return 0;
80 }
81
82 static int rtc_proc_open(struct inode *inode, struct file *file)
83 {
84         struct class_device *class_dev = PDE(inode)->data;
85
86         if (!try_module_get(THIS_MODULE))
87                 return -ENODEV;
88
89         return single_open(file, rtc_proc_show, class_dev);
90 }
91
92 static int rtc_proc_release(struct inode *inode, struct file *file)
93 {
94         int res = single_release(inode, file);
95         module_put(THIS_MODULE);
96         return res;
97 }
98
99 static struct file_operations rtc_proc_fops = {
100         .open           = rtc_proc_open,
101         .read           = seq_read,
102         .llseek         = seq_lseek,
103         .release        = rtc_proc_release,
104 };
105
106 static int rtc_proc_add_device(struct class_device *class_dev,
107                                         struct class_interface *class_intf)
108 {
109         mutex_lock(&rtc_lock);
110         if (rtc_dev == NULL) {
111                 struct proc_dir_entry *ent;
112
113                 rtc_dev = class_dev;
114
115                 ent = create_proc_entry("driver/rtc", 0, NULL);
116                 if (ent) {
117                         struct rtc_device *rtc = to_rtc_device(class_dev);
118
119                         ent->proc_fops = &rtc_proc_fops;
120                         ent->owner = rtc->owner;
121                         ent->data = class_dev;
122
123                         dev_dbg(class_dev->dev, "rtc intf: proc\n");
124                 }
125                 else
126                         rtc_dev = NULL;
127         }
128         mutex_unlock(&rtc_lock);
129
130         return 0;
131 }
132
133 static void rtc_proc_remove_device(struct class_device *class_dev,
134                                         struct class_interface *class_intf)
135 {
136         mutex_lock(&rtc_lock);
137         if (rtc_dev == class_dev) {
138                 remove_proc_entry("driver/rtc", NULL);
139                 rtc_dev = NULL;
140         }
141         mutex_unlock(&rtc_lock);
142 }
143
144 static struct class_interface rtc_proc_interface = {
145         .add = &rtc_proc_add_device,
146         .remove = &rtc_proc_remove_device,
147 };
148
149 static int __init rtc_proc_init(void)
150 {
151         return rtc_interface_register(&rtc_proc_interface);
152 }
153
154 static void __exit rtc_proc_exit(void)
155 {
156         class_interface_unregister(&rtc_proc_interface);
157 }
158
159 subsys_initcall(rtc_proc_init);
160 module_exit(rtc_proc_exit);
161
162 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
163 MODULE_DESCRIPTION("RTC class proc interface");
164 MODULE_LICENSE("GPL");