rtc-proc.c revision a2db8dfce8d94fecae50128d912fec7980687a51 
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
19static struct class_device *rtc_dev = NULL;
20static DEFINE_MUTEX(rtc_lock);
21
22static 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, "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(class_dev->dev, seq);
78
79	return 0;
80}
81
82static 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
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 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
106static 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
133static 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
144static struct class_interface rtc_proc_interface = {
145	.add = &rtc_proc_add_device,
146	.remove = &rtc_proc_remove_device,
147};
148
149static int __init rtc_proc_init(void)
150{
151	return rtc_interface_register(&rtc_proc_interface);
152}
153
154static void __exit rtc_proc_exit(void)
155{
156	class_interface_unregister(&rtc_proc_interface);
157}
158
159subsys_initcall(rtc_proc_init);
160module_exit(rtc_proc_exit);
161
162MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
163MODULE_DESCRIPTION("RTC class proc interface");
164MODULE_LICENSE("GPL");
165