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
 22static int rtc_proc_show(struct seq_file *seq, void *offset)
 23{
 24	int err;
 25	struct rtc_device *rtc = seq->private;
 26	const struct rtc_class_ops *ops = rtc->ops;
 27	struct rtc_wkalrm alrm;
 28	struct rtc_time tm;
 29
 30	err = rtc_read_time(rtc, &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(rtc, &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		seq_printf(seq, "update IRQ enabled\t: %s\n",
 73			(rtc->uie_rtctimer.enabled) ? "yes" : "no");
 74		seq_printf(seq, "periodic IRQ enabled\t: %s\n",
 75			(rtc->pie_enabled) ? "yes" : "no");
 76		seq_printf(seq, "periodic IRQ frequency\t: %d\n",
 77			rtc->irq_freq);
 78		seq_printf(seq, "max user IRQ frequency\t: %d\n",
 79			rtc->max_user_freq);
 80	}
 81
 82	seq_printf(seq, "24hr\t\t: yes\n");
 83
 84	if (ops->proc)
 85		ops->proc(rtc->dev.parent, seq);
 86
 87	return 0;
 88}
 89
 90static int rtc_proc_open(struct inode *inode, struct file *file)
 91{
 92	int ret;
 93	struct rtc_device *rtc = PDE(inode)->data;
 94
 95	if (!try_module_get(THIS_MODULE))
 96		return -ENODEV;
 97
 98	ret = single_open(file, rtc_proc_show, rtc);
 99	if (ret)
100		module_put(THIS_MODULE);
101	return ret;
102}
103
104static int rtc_proc_release(struct inode *inode, struct file *file)
105{
106	int res = single_release(inode, file);
107	module_put(THIS_MODULE);
108	return res;
109}
110
111static const struct file_operations rtc_proc_fops = {
112	.open		= rtc_proc_open,
113	.read		= seq_read,
114	.llseek		= seq_lseek,
115	.release	= rtc_proc_release,
116};
117
118void rtc_proc_add_device(struct rtc_device *rtc)
119{
120	if (rtc->id == 0)
121		proc_create_data("driver/rtc", 0, NULL, &rtc_proc_fops, rtc);
122}
123
124void rtc_proc_del_device(struct rtc_device *rtc)
125{
126	if (rtc->id == 0)
127		remove_proc_entry("driver/rtc", NULL);
128}