rtc: make rtc-ds1553 driver hotplug-aware
[linux-3.10.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 #include "rtc-core.h"
20
21
22 static int rtc_proc_show(struct seq_file *seq, void *offset)
23 {
24         int err;
25         struct rtc_device *rtc = seq->private;
26         const struct rtc_class_ops *ops = rtc->ops;
27         struct rtc_wkalrm alrm;
28         struct rtc_time tm;
29
30         err = rtc_read_time(rtc, &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(rtc, &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, "alarm_IRQ\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(rtc->dev.parent, seq);
78
79         return 0;
80 }
81
82 static int rtc_proc_open(struct inode *inode, struct file *file)
83 {
84         struct rtc_device *rtc = PDE(inode)->data;
85
86         if (!try_module_get(THIS_MODULE))
87                 return -ENODEV;
88
89         return single_open(file, rtc_proc_show, rtc);
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 const 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 void rtc_proc_add_device(struct rtc_device *rtc)
107 {
108         if (rtc->id == 0) {
109                 struct proc_dir_entry *ent;
110
111                 ent = create_proc_entry("driver/rtc", 0, NULL);
112                 if (ent) {
113                         ent->proc_fops = &rtc_proc_fops;
114                         ent->owner = rtc->owner;
115                         ent->data = rtc;
116                 }
117         }
118 }
119
120 void rtc_proc_del_device(struct rtc_device *rtc)
121 {
122         if (rtc->id == 0)
123                 remove_proc_entry("driver/rtc", NULL);
124 }