2 * RTC subsystem, proc interface
4 * Copyright (C) 2005-06 Tower Technologies
5 * Author: Alessandro Zummo <a.zummo@towertech.it>
7 * based on arch/arm/common/rtctime.c
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.
14 #include <linux/module.h>
15 #include <linux/rtc.h>
16 #include <linux/proc_fs.h>
17 #include <linux/seq_file.h>
19 static struct class_device *rtc_dev = NULL;
20 static DEFINE_MUTEX(rtc_lock);
22 static int rtc_proc_show(struct seq_file *seq, void *offset)
25 struct class_device *class_dev = seq->private;
26 struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
27 struct rtc_wkalrm alrm;
30 err = rtc_read_time(class_dev, &tm);
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);
39 err = rtc_read_alarm(class_dev, &alrm);
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);
45 seq_printf(seq, "**:");
46 if ((unsigned int)alrm.time.tm_min <= 59)
47 seq_printf(seq, "%02d:", alrm.time.tm_min);
49 seq_printf(seq, "**:");
50 if ((unsigned int)alrm.time.tm_sec <= 59)
51 seq_printf(seq, "%02d\n", alrm.time.tm_sec);
53 seq_printf(seq, "**\n");
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);
59 seq_printf(seq, "****-");
60 if ((unsigned int)alrm.time.tm_mon <= 11)
61 seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
63 seq_printf(seq, "**-");
64 if ((unsigned int)alrm.time.tm_mday <= 31)
65 seq_printf(seq, "%02d\n", alrm.time.tm_mday);
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");
75 ops->proc(class_dev->dev, seq);
80 static int rtc_proc_open(struct inode *inode, struct file *file)
82 struct class_device *class_dev = PDE(inode)->data;
84 if (!try_module_get(THIS_MODULE))
87 return single_open(file, rtc_proc_show, class_dev);
90 static int rtc_proc_release(struct inode *inode, struct file *file)
92 int res = single_release(inode, file);
93 module_put(THIS_MODULE);
97 static struct file_operations rtc_proc_fops = {
98 .open = rtc_proc_open,
101 .release = rtc_proc_release,
104 static int rtc_proc_add_device(struct class_device *class_dev,
105 struct class_interface *class_intf)
107 mutex_lock(&rtc_lock);
108 if (rtc_dev == NULL) {
109 struct proc_dir_entry *ent;
113 ent = create_proc_entry("driver/rtc", 0, NULL);
115 struct rtc_device *rtc = to_rtc_device(class_dev);
117 ent->proc_fops = &rtc_proc_fops;
118 ent->owner = rtc->owner;
119 ent->data = class_dev;
121 dev_info(class_dev->dev, "rtc intf: proc\n");
126 mutex_unlock(&rtc_lock);
131 static void rtc_proc_remove_device(struct class_device *class_dev,
132 struct class_interface *class_intf)
134 mutex_lock(&rtc_lock);
135 if (rtc_dev == class_dev) {
136 remove_proc_entry("driver/rtc", NULL);
139 mutex_unlock(&rtc_lock);
142 static struct class_interface rtc_proc_interface = {
143 .add = &rtc_proc_add_device,
144 .remove = &rtc_proc_remove_device,
147 static int __init rtc_proc_init(void)
149 return rtc_interface_register(&rtc_proc_interface);
152 static void __exit rtc_proc_exit(void)
154 class_interface_unregister(&rtc_proc_interface);
157 module_init(rtc_proc_init);
158 module_exit(rtc_proc_exit);
160 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
161 MODULE_DESCRIPTION("RTC class proc interface");
162 MODULE_LICENSE("GPL");