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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#define NAME_SIZE 10
22
23#if defined(CONFIG_RTC_HCTOSYS_DEVICE)
24static bool is_rtc_hctosys(struct rtc_device *rtc)
25{
26 int size;
27 char name[NAME_SIZE];
28
29 size = scnprintf(name, NAME_SIZE, "rtc%d", rtc->id);
30 if (size > NAME_SIZE)
31 return false;
32
33 return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
34}
35#else
36static bool is_rtc_hctosys(struct rtc_device *rtc)
37{
38 return (rtc->id == 0);
39}
40#endif
41
42static int rtc_proc_show(struct seq_file *seq, void *offset)
43{
44 int err;
45 struct rtc_device *rtc = seq->private;
46 const struct rtc_class_ops *ops = rtc->ops;
47 struct rtc_wkalrm alrm;
48 struct rtc_time tm;
49
50 err = rtc_read_time(rtc, &tm);
51 if (err == 0) {
52 seq_printf(seq,
53 "rtc_time\t: %02d:%02d:%02d\n"
54 "rtc_date\t: %04d-%02d-%02d\n",
55 tm.tm_hour, tm.tm_min, tm.tm_sec,
56 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
57 }
58
59 err = rtc_read_alarm(rtc, &alrm);
60 if (err == 0) {
61 seq_printf(seq, "alrm_time\t: ");
62 if ((unsigned int)alrm.time.tm_hour <= 24)
63 seq_printf(seq, "%02d:", alrm.time.tm_hour);
64 else
65 seq_printf(seq, "**:");
66 if ((unsigned int)alrm.time.tm_min <= 59)
67 seq_printf(seq, "%02d:", alrm.time.tm_min);
68 else
69 seq_printf(seq, "**:");
70 if ((unsigned int)alrm.time.tm_sec <= 59)
71 seq_printf(seq, "%02d\n", alrm.time.tm_sec);
72 else
73 seq_printf(seq, "**\n");
74
75 seq_printf(seq, "alrm_date\t: ");
76 if ((unsigned int)alrm.time.tm_year <= 200)
77 seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
78 else
79 seq_printf(seq, "****-");
80 if ((unsigned int)alrm.time.tm_mon <= 11)
81 seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
82 else
83 seq_printf(seq, "**-");
84 if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
85 seq_printf(seq, "%02d\n", alrm.time.tm_mday);
86 else
87 seq_printf(seq, "**\n");
88 seq_printf(seq, "alarm_IRQ\t: %s\n",
89 alrm.enabled ? "yes" : "no");
90 seq_printf(seq, "alrm_pending\t: %s\n",
91 alrm.pending ? "yes" : "no");
92 seq_printf(seq, "update IRQ enabled\t: %s\n",
93 (rtc->uie_rtctimer.enabled) ? "yes" : "no");
94 seq_printf(seq, "periodic IRQ enabled\t: %s\n",
95 (rtc->pie_enabled) ? "yes" : "no");
96 seq_printf(seq, "periodic IRQ frequency\t: %d\n",
97 rtc->irq_freq);
98 seq_printf(seq, "max user IRQ frequency\t: %d\n",
99 rtc->max_user_freq);
100 }
101
102 seq_printf(seq, "24hr\t\t: yes\n");
103
104 if (ops->proc)
105 ops->proc(rtc->dev.parent, seq);
106
107 return 0;
108}
109
110static int rtc_proc_open(struct inode *inode, struct file *file)
111{
112 int ret;
113 struct rtc_device *rtc = PDE_DATA(inode);
114
115 if (!try_module_get(rtc->owner))
116 return -ENODEV;
117
118 ret = single_open(file, rtc_proc_show, rtc);
119 if (ret)
120 module_put(rtc->owner);
121 return ret;
122}
123
124static int rtc_proc_release(struct inode *inode, struct file *file)
125{
126 int res = single_release(inode, file);
127 struct rtc_device *rtc = PDE_DATA(inode);
128
129 module_put(rtc->owner);
130 return res;
131}
132
133static const struct file_operations rtc_proc_fops = {
134 .open = rtc_proc_open,
135 .read = seq_read,
136 .llseek = seq_lseek,
137 .release = rtc_proc_release,
138};
139
140void rtc_proc_add_device(struct rtc_device *rtc)
141{
142 if (is_rtc_hctosys(rtc))
143 proc_create_data("driver/rtc", 0, NULL, &rtc_proc_fops, rtc);
144}
145
146void rtc_proc_del_device(struct rtc_device *rtc)
147{
148 if (is_rtc_hctosys(rtc))
149 remove_proc_entry("driver/rtc", NULL);
150}