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
22static 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
82static 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
92static 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
99static 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
106void 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
120void rtc_proc_del_device(struct rtc_device *rtc)
121{
122	if (rtc->id == 0)
123		remove_proc_entry("driver/rtc", NULL);
124}
125