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(THIS_MODULE))
116		return -ENODEV;
117
118	ret = single_open(file, rtc_proc_show, rtc);
119	if (ret)
120		module_put(THIS_MODULE);
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	module_put(THIS_MODULE);
128	return res;
129}
130
131static const struct file_operations rtc_proc_fops = {
132	.open		= rtc_proc_open,
133	.read		= seq_read,
134	.llseek		= seq_lseek,
135	.release	= rtc_proc_release,
136};
137
138void rtc_proc_add_device(struct rtc_device *rtc)
139{
140	if (is_rtc_hctosys(rtc))
141		proc_create_data("driver/rtc", 0, NULL, &rtc_proc_fops, rtc);
142}
143
144void rtc_proc_del_device(struct rtc_device *rtc)
145{
146	if (is_rtc_hctosys(rtc))
147		remove_proc_entry("driver/rtc", NULL);
148}
149