drivers/rtc/rtc-proc.c

   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
  22 static 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
  90 static 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
 104 static 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
 111 static 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
 118 void 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
 124 void rtc_proc_del_device(struct rtc_device *rtc)
 125 {
 126         if (rtc->id == 0)
 127                 remove_proc_entry("driver/rtc", NULL);
 128 }