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 static struct class_device *rtc_dev = NULL;
  20 static DEFINE_MUTEX(rtc_lock);
  21
  22 static int rtc_proc_show(struct seq_file *seq, void *offset)
  23 {
  24         int err;
  25         struct class_device *class_dev = seq->private;
  26         const struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
  27         struct rtc_wkalrm alrm;
  28         struct rtc_time tm;
  29
  30         err = rtc_read_time(class_dev, &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(class_dev, &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, "alrm_wakeup\t: %s\n",
  69                                 alrm.enabled ? "yes" : "no");
  70                 seq_printf(seq, "alrm_pending\t: %s\n",
  71                                 alrm.pending ? "yes" : "no");
  72         }
  73
  74         seq_printf(seq, "24hr\t\t: yes\n");
  75
  76         if (ops->proc)
  77                 ops->proc(class_dev->dev, seq);
  78
  79         return 0;
  80 }
  81
  82 static int rtc_proc_open(struct inode *inode, struct file *file)
  83 {
  84         struct class_device *class_dev = PDE(inode)->data;
  85
  86         if (!try_module_get(THIS_MODULE))
  87                 return -ENODEV;
  88
  89         return single_open(file, rtc_proc_show, class_dev);
  90 }
  91
  92 static int rtc_proc_release(struct inode *inode, struct file *file)
  93 {
  94         int res = single_release(inode, file);
  95         module_put(THIS_MODULE);
  96         return res;
  97 }
  98
  99 static struct file_operations rtc_proc_fops = {
 100         .open           = rtc_proc_open,
 101         .read           = seq_read,
 102         .llseek         = seq_lseek,
 103         .release        = rtc_proc_release,
 104 };
 105
 106 static int rtc_proc_add_device(struct class_device *class_dev,
 107                                         struct class_interface *class_intf)
 108 {
 109         mutex_lock(&rtc_lock);
 110         if (rtc_dev == NULL) {
 111                 struct proc_dir_entry *ent;
 112
 113                 rtc_dev = class_dev;
 114
 115                 ent = create_proc_entry("driver/rtc", 0, NULL);
 116                 if (ent) {
 117                         struct rtc_device *rtc = to_rtc_device(class_dev);
 118
 119                         ent->proc_fops = &rtc_proc_fops;
 120                         ent->owner = rtc->owner;
 121                         ent->data = class_dev;
 122
 123                         dev_info(class_dev->dev, "rtc intf: proc\n");
 124                 }
 125                 else
 126                         rtc_dev = NULL;
 127         }
 128         mutex_unlock(&rtc_lock);
 129
 130         return 0;
 131 }
 132
 133 static void rtc_proc_remove_device(struct class_device *class_dev,
 134                                         struct class_interface *class_intf)
 135 {
 136         mutex_lock(&rtc_lock);
 137         if (rtc_dev == class_dev) {
 138                 remove_proc_entry("driver/rtc", NULL);
 139                 rtc_dev = NULL;
 140         }
 141         mutex_unlock(&rtc_lock);
 142 }
 143
 144 static struct class_interface rtc_proc_interface = {
 145         .add = &rtc_proc_add_device,
 146         .remove = &rtc_proc_remove_device,
 147 };
 148
 149 static int __init rtc_proc_init(void)
 150 {
 151         return rtc_interface_register(&rtc_proc_interface);
 152 }
 153
 154 static void __exit rtc_proc_exit(void)
 155 {
 156         class_interface_unregister(&rtc_proc_interface);
 157 }
 158
 159 subsys_initcall(rtc_proc_init);
 160 module_exit(rtc_proc_exit);
 161
 162 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 163 MODULE_DESCRIPTION("RTC class proc interface");
 164 MODULE_LICENSE("GPL");