/*
   * RTC subsystem, proc interface
   *
   * Copyright (C) 2005-06 Tower Technologies
   * Author: Alessandro Zummo <a.zummo@towertech.it>
   *
   * based on arch/arm/common/rtctime.c
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
  */
  
  #include <linux/module.h>
  #include <linux/rtc.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>

  #include "rtc-core.h"

  static int rtc_proc_show(struct seq_file *seq, void *offset)
  {
  	int err;

  	struct rtc_device *rtc = seq->private;
  	const struct rtc_class_ops *ops = rtc->ops;

  	struct rtc_wkalrm alrm;
  	struct rtc_time tm;

  	err = rtc_read_time(rtc, &tm);

  	if (err == 0) {
  		seq_printf(seq,
  			"rtc_time\t: %02d:%02d:%02d
  "
  			"rtc_date\t: %04d-%02d-%02d
  ",
  			tm.tm_hour, tm.tm_min, tm.tm_sec,
  			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
  	}

  	err = rtc_read_alarm(rtc, &alrm);

  	if (err == 0) {
  		seq_printf(seq, "alrm_time\t: ");
  		if ((unsigned int)alrm.time.tm_hour <= 24)
  			seq_printf(seq, "%02d:", alrm.time.tm_hour);
  		else
  			seq_printf(seq, "**:");
  		if ((unsigned int)alrm.time.tm_min <= 59)
  			seq_printf(seq, "%02d:", alrm.time.tm_min);
  		else
  			seq_printf(seq, "**:");
  		if ((unsigned int)alrm.time.tm_sec <= 59)
  			seq_printf(seq, "%02d
  ", alrm.time.tm_sec);
  		else
  			seq_printf(seq, "**
  ");
  
  		seq_printf(seq, "alrm_date\t: ");
  		if ((unsigned int)alrm.time.tm_year <= 200)
  			seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
  		else
  			seq_printf(seq, "****-");
  		if ((unsigned int)alrm.time.tm_mon <= 11)
  			seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
  		else
  			seq_printf(seq, "**-");

  		if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)

  			seq_printf(seq, "%02d
  ", alrm.time.tm_mday);
  		else
  			seq_printf(seq, "**
  ");

  		seq_printf(seq, "alarm_IRQ\t: %s
  ",

  				alrm.enabled ? "yes" : "no");
  		seq_printf(seq, "alrm_pending\t: %s
  ",
  				alrm.pending ? "yes" : "no");

  		seq_printf(seq, "update IRQ enabled\t: %s
  ",
  			(rtc->uie_rtctimer.enabled) ? "yes" : "no");
  		seq_printf(seq, "periodic IRQ enabled\t: %s
  ",
  			(rtc->pie_enabled) ? "yes" : "no");
  		seq_printf(seq, "periodic IRQ frequency\t: %d
  ",
  			rtc->irq_freq);
  		seq_printf(seq, "max user IRQ frequency\t: %d
  ",
  			rtc->max_user_freq);

  	}

  	seq_printf(seq, "24hr\t\t: yes
  ");

  	if (ops->proc)

  		ops->proc(rtc->dev.parent, seq);

  
  	return 0;
  }
  
  static int rtc_proc_open(struct inode *inode, struct file *file)
  {

  	int ret;

  	struct rtc_device *rtc = PDE(inode)->data;

  
  	if (!try_module_get(THIS_MODULE))
  		return -ENODEV;

  	ret = single_open(file, rtc_proc_show, rtc);
  	if (ret)
  		module_put(THIS_MODULE);
  	return ret;

  }
  
  static int rtc_proc_release(struct inode *inode, struct file *file)
  {
  	int res = single_release(inode, file);
  	module_put(THIS_MODULE);
  	return res;
  }

  static const struct file_operations rtc_proc_fops = {

  	.open		= rtc_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= rtc_proc_release,
  };

  void rtc_proc_add_device(struct rtc_device *rtc)

  {

  	if (rtc->id == 0)
  		proc_create_data("driver/rtc", 0, NULL, &rtc_proc_fops, rtc);

  }

  void rtc_proc_del_device(struct rtc_device *rtc)

  {

  	if (rtc->id == 0)

  		remove_proc_entry("driver/rtc", NULL);

  }