1// SPDX-License-Identifier: GPL-2.0
2/*
3 * RTC subsystem, proc interface
4 *
5 * Copyright (C) 2005-06 Tower Technologies
6 * Author: Alessandro Zummo <a.zummo@towertech.it>
7 *
8 * based on arch/arm/common/rtctime.c
9 */
10
11#include <linux/module.h>
12#include <linux/rtc.h>
13#include <linux/proc_fs.h>
14#include <linux/seq_file.h>
15
16#include "rtc-core.h"
17
18#define NAME_SIZE	10
19
20#if defined(CONFIG_RTC_HCTOSYS_DEVICE)
21static bool is_rtc_hctosys(struct rtc_device *rtc)
22{
23	int size;
24	char name[NAME_SIZE];
25
26	size = snprintf(name, NAME_SIZE, "rtc%d", rtc->id);
27	if (size >= NAME_SIZE)
28		return false;
29
30	return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
31}
32#else
33static bool is_rtc_hctosys(struct rtc_device *rtc)
34{
35	return (rtc->id == 0);
36}
37#endif
38
39static int rtc_proc_show(struct seq_file *seq, void *offset)
40{
41	int err;
42	struct rtc_device *rtc = seq->private;
43	const struct rtc_class_ops *ops = rtc->ops;
44	struct rtc_wkalrm alrm;
45	struct rtc_time tm;
46
47	err = rtc_read_time(rtc, &tm);
48	if (err == 0) {
49		seq_printf(seq,
50			   "rtc_time\t: %ptRt\n"
51			   "rtc_date\t: %ptRd\n",
52			   &tm, &tm);
53	}
54
55	err = rtc_read_alarm(rtc, &alrm);
56	if (err == 0) {
57		seq_printf(seq, "alrm_time\t: %ptRt\n", &alrm.time);
58		seq_printf(seq, "alrm_date\t: %ptRd\n", &alrm.time);
59		seq_printf(seq, "alarm_IRQ\t: %s\n",
60			   alrm.enabled ? "yes" : "no");
61		seq_printf(seq, "alrm_pending\t: %s\n",
62			   alrm.pending ? "yes" : "no");
63		seq_printf(seq, "update IRQ enabled\t: %s\n",
64			   (rtc->uie_rtctimer.enabled) ? "yes" : "no");
65		seq_printf(seq, "periodic IRQ enabled\t: %s\n",
66			   (rtc->pie_enabled) ? "yes" : "no");
67		seq_printf(seq, "periodic IRQ frequency\t: %d\n",
68			   rtc->irq_freq);
69		seq_printf(seq, "max user IRQ frequency\t: %d\n",
70			   rtc->max_user_freq);
71	}
72
73	seq_printf(seq, "24hr\t\t: yes\n");
74
75	if (ops->proc)
76		ops->proc(rtc->dev.parent, seq);
77
78	return 0;
79}
80
81void rtc_proc_add_device(struct rtc_device *rtc)
82{
83	if (is_rtc_hctosys(rtc))
84		proc_create_single_data("driver/rtc", 0, NULL, rtc_proc_show,
85					rtc);
86}
87
88void rtc_proc_del_device(struct rtc_device *rtc)
89{
90	if (is_rtc_hctosys(rtc))
91		remove_proc_entry("driver/rtc", NULL);
92}
93