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 struct class_device *rtc_dev = NULL;
  23 static DEFINE_MUTEX(rtc_lock);
  24
  25 static int rtc_proc_show(struct seq_file *seq, void *offset)
  26 {
  27         int err;
  28         struct rtc_device *rtc = seq->private;
  29         const struct rtc_class_ops *ops = rtc->ops;
  30         struct rtc_wkalrm alrm;
  31         struct rtc_time tm;
  32
  33         err = rtc_read_time(rtc, &tm);
  34         if (err == 0) {
  35                 seq_printf(seq,
  36                         "rtc_time\t: %02d:%02d:%02d\n"
  37                         "rtc_date\t: %04d-%02d-%02d\n",
  38                         tm.tm_hour, tm.tm_min, tm.tm_sec,
  39                         tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
  40         }
  41
  42         err = rtc_read_alarm(rtc, &alrm);
  43         if (err == 0) {
  44                 seq_printf(seq, "alrm_time\t: ");
  45                 if ((unsigned int)alrm.time.tm_hour <= 24)
  46                         seq_printf(seq, "%02d:", alrm.time.tm_hour);
  47                 else
  48                         seq_printf(seq, "**:");
  49                 if ((unsigned int)alrm.time.tm_min <= 59)
  50                         seq_printf(seq, "%02d:", alrm.time.tm_min);
  51                 else
  52                         seq_printf(seq, "**:");
  53                 if ((unsigned int)alrm.time.tm_sec <= 59)
  54                         seq_printf(seq, "%02d\n", alrm.time.tm_sec);
  55                 else
  56                         seq_printf(seq, "**\n");
  57
  58                 seq_printf(seq, "alrm_date\t: ");
  59                 if ((unsigned int)alrm.time.tm_year <= 200)
  60                         seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
  61                 else
  62                         seq_printf(seq, "****-");
  63                 if ((unsigned int)alrm.time.tm_mon <= 11)
  64                         seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
  65                 else
  66                         seq_printf(seq, "**-");
  67                 if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
  68                         seq_printf(seq, "%02d\n", alrm.time.tm_mday);
  69                 else
  70                         seq_printf(seq, "**\n");
  71                 seq_printf(seq, "alarm_IRQ\t: %s\n",
  72                                 alrm.enabled ? "yes" : "no");
  73                 seq_printf(seq, "alrm_pending\t: %s\n",
  74                                 alrm.pending ? "yes" : "no");
  75         }
  76
  77         seq_printf(seq, "24hr\t\t: yes\n");
  78
  79         if (ops->proc)
  80                 ops->proc(rtc->class_dev.dev, seq);
  81
  82         return 0;
  83 }
  84
  85 static int rtc_proc_open(struct inode *inode, struct file *file)
  86 {
  87         struct rtc_device *rtc = PDE(inode)->data;
  88
  89         if (!try_module_get(THIS_MODULE))
  90                 return -ENODEV;
  91
  92         return single_open(file, rtc_proc_show, rtc);
  93 }
  94
  95 static int rtc_proc_release(struct inode *inode, struct file *file)
  96 {
  97         int res = single_release(inode, file);
  98         module_put(THIS_MODULE);
  99         return res;
 100 }
 101
 102 static const struct file_operations rtc_proc_fops = {
 103         .open           = rtc_proc_open,
 104         .read           = seq_read,
 105         .llseek         = seq_lseek,
 106         .release        = rtc_proc_release,
 107 };
 108
 109 static int rtc_proc_add_device(struct class_device *class_dev,
 110                                         struct class_interface *class_intf)
 111 {
 112         mutex_lock(&rtc_lock);
 113         if (rtc_dev == NULL) {
 114                 struct proc_dir_entry *ent;
 115
 116                 rtc_dev = class_dev;
 117
 118                 ent = create_proc_entry("driver/rtc", 0, NULL);
 119                 if (ent) {
 120                         struct rtc_device *rtc = to_rtc_device(class_dev);
 121
 122                         ent->proc_fops = &rtc_proc_fops;
 123                         ent->owner = rtc->owner;
 124                         ent->data = rtc;
 125
 126                         dev_dbg(class_dev->dev, "rtc intf: proc\n");
 127                 }
 128                 else
 129                         rtc_dev = NULL;
 130         }
 131         mutex_unlock(&rtc_lock);
 132
 133         return 0;
 134 }
 135
 136 static void rtc_proc_remove_device(struct class_device *class_dev,
 137                                         struct class_interface *class_intf)
 138 {
 139         mutex_lock(&rtc_lock);
 140         if (rtc_dev == class_dev) {
 141                 remove_proc_entry("driver/rtc", NULL);
 142                 rtc_dev = NULL;
 143         }
 144         mutex_unlock(&rtc_lock);
 145 }
 146
 147 static struct class_interface rtc_proc_interface = {
 148         .add = &rtc_proc_add_device,
 149         .remove = &rtc_proc_remove_device,
 150 };
 151
 152 static int __init rtc_proc_init(void)
 153 {
 154         return rtc_interface_register(&rtc_proc_interface);
 155 }
 156
 157 static void __exit rtc_proc_exit(void)
 158 {
 159         class_interface_unregister(&rtc_proc_interface);
 160 }
 161
 162 subsys_initcall(rtc_proc_init);
 163 module_exit(rtc_proc_exit);
 164
 165 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 166 MODULE_DESCRIPTION("RTC class proc interface");
 167 MODULE_LICENSE("GPL");