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 #define NAME_SIZE       10
  22
  23 #if defined(CONFIG_RTC_HCTOSYS_DEVICE)
  24 static bool is_rtc_hctosys(struct rtc_device *rtc)
  25 {
  26         int size;
  27         char name[NAME_SIZE];
  28
  29         size = scnprintf(name, NAME_SIZE, "rtc%d", rtc->id);
  30         if (size > NAME_SIZE)
  31                 return false;
  32
  33         return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
  34 }
  35 #else
  36 static bool is_rtc_hctosys(struct rtc_device *rtc)
  37 {
  38         return (rtc->id == 0);
  39 }
  40 #endif
  41
  42 static int rtc_proc_show(struct seq_file *seq, void *offset)
  43 {
  44         int err;
  45         struct rtc_device *rtc = seq->private;
  46         const struct rtc_class_ops *ops = rtc->ops;
  47         struct rtc_wkalrm alrm;
  48         struct rtc_time tm;
  49
  50         err = rtc_read_time(rtc, &tm);
  51         if (err == 0) {
  52                 seq_printf(seq,
  53                         "rtc_time\t: %02d:%02d:%02d\n"
  54                         "rtc_date\t: %04d-%02d-%02d\n",
  55                         tm.tm_hour, tm.tm_min, tm.tm_sec,
  56                         tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
  57         }
  58
  59         err = rtc_read_alarm(rtc, &alrm);
  60         if (err == 0) {
  61                 seq_printf(seq, "alrm_time\t: ");
  62                 if ((unsigned int)alrm.time.tm_hour <= 24)
  63                         seq_printf(seq, "%02d:", alrm.time.tm_hour);
  64                 else
  65                         seq_printf(seq, "**:");
  66                 if ((unsigned int)alrm.time.tm_min <= 59)
  67                         seq_printf(seq, "%02d:", alrm.time.tm_min);
  68                 else
  69                         seq_printf(seq, "**:");
  70                 if ((unsigned int)alrm.time.tm_sec <= 59)
  71                         seq_printf(seq, "%02d\n", alrm.time.tm_sec);
  72                 else
  73                         seq_printf(seq, "**\n");
  74
  75                 seq_printf(seq, "alrm_date\t: ");
  76                 if ((unsigned int)alrm.time.tm_year <= 200)
  77                         seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
  78                 else
  79                         seq_printf(seq, "****-");
  80                 if ((unsigned int)alrm.time.tm_mon <= 11)
  81                         seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
  82                 else
  83                         seq_printf(seq, "**-");
  84                 if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
  85                         seq_printf(seq, "%02d\n", alrm.time.tm_mday);
  86                 else
  87                         seq_printf(seq, "**\n");
  88                 seq_printf(seq, "alarm_IRQ\t: %s\n",
  89                                 alrm.enabled ? "yes" : "no");
  90                 seq_printf(seq, "alrm_pending\t: %s\n",
  91                                 alrm.pending ? "yes" : "no");
  92                 seq_printf(seq, "update IRQ enabled\t: %s\n",
  93                         (rtc->uie_rtctimer.enabled) ? "yes" : "no");
  94                 seq_printf(seq, "periodic IRQ enabled\t: %s\n",
  95                         (rtc->pie_enabled) ? "yes" : "no");
  96                 seq_printf(seq, "periodic IRQ frequency\t: %d\n",
  97                         rtc->irq_freq);
  98                 seq_printf(seq, "max user IRQ frequency\t: %d\n",
  99                         rtc->max_user_freq);
 100         }
 101
 102         seq_printf(seq, "24hr\t\t: yes\n");
 103
 104         if (ops->proc)
 105                 ops->proc(rtc->dev.parent, seq);
 106
 107         return 0;
 108 }
 109
 110 static int rtc_proc_open(struct inode *inode, struct file *file)
 111 {
 112         int ret;
 113         struct rtc_device *rtc = PDE_DATA(inode);
 114
 115         if (!try_module_get(THIS_MODULE))
 116                 return -ENODEV;
 117
 118         ret = single_open(file, rtc_proc_show, rtc);
 119         if (ret)
 120                 module_put(THIS_MODULE);
 121         return ret;
 122 }
 123
 124 static int rtc_proc_release(struct inode *inode, struct file *file)
 125 {
 126         int res = single_release(inode, file);
 127         module_put(THIS_MODULE);
 128         return res;
 129 }
 130
 131 static const struct file_operations rtc_proc_fops = {
 132         .open           = rtc_proc_open,
 133         .read           = seq_read,
 134         .llseek         = seq_lseek,
 135         .release        = rtc_proc_release,
 136 };
 137
 138 void rtc_proc_add_device(struct rtc_device *rtc)
 139 {
 140         if (is_rtc_hctosys(rtc))
 141                 proc_create_data("driver/rtc", 0, NULL, &rtc_proc_fops, rtc);
 142 }
 143
 144 void rtc_proc_del_device(struct rtc_device *rtc)
 145 {
 146         if (is_rtc_hctosys(rtc))
 147                 remove_proc_entry("driver/rtc", NULL);
 148 }