drivers/rtc/proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * RTC subsystem, proc interface
   4  *
   5  * Copyright (C) 2005-06 Tower Technologies
   6  * Author: Alessandro Zummo <a.zummo@towertech.it>
   7  *
   8  * based on arch/arm/common/rtctime.c
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/rtc.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/seq_file.h>
  15
  16 #include "rtc-core.h"
  17
  18 #define NAME_SIZE       10
  19
  20 #if defined(CONFIG_RTC_HCTOSYS_DEVICE)
  21 static bool is_rtc_hctosys(struct rtc_device *rtc)
  22 {
  23         int size;
  24         char name[NAME_SIZE];
  25
  26         size = scnprintf(name, NAME_SIZE, "rtc%d", rtc->id);
  27         if (size > NAME_SIZE)
  28                 return false;
  29
  30         return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
  31 }
  32 #else
  33 static bool is_rtc_hctosys(struct rtc_device *rtc)
  34 {
  35         return (rtc->id == 0);
  36 }
  37 #endif
  38
  39 static int rtc_proc_show(struct seq_file *seq, void *offset)
  40 {
  41         int err;
  42         struct rtc_device *rtc = seq->private;
  43         const struct rtc_class_ops *ops = rtc->ops;
  44         struct rtc_wkalrm alrm;
  45         struct rtc_time tm;
  46
  47         err = rtc_read_time(rtc, &tm);
  48         if (err == 0) {
  49                 seq_printf(seq,
  50                            "rtc_time\t: %ptRt\n"
  51                            "rtc_date\t: %ptRd\n",
  52                            &tm, &tm);
  53         }
  54
  55         err = rtc_read_alarm(rtc, &alrm);
  56         if (err == 0) {
  57                 seq_printf(seq, "alrm_time\t: %ptRt\n", &alrm.time);
  58                 seq_printf(seq, "alrm_date\t: %ptRd\n", &alrm.time);
  59                 seq_printf(seq, "alarm_IRQ\t: %s\n",
  60                            alrm.enabled ? "yes" : "no");
  61                 seq_printf(seq, "alrm_pending\t: %s\n",
  62                            alrm.pending ? "yes" : "no");
  63                 seq_printf(seq, "update IRQ enabled\t: %s\n",
  64                            (rtc->uie_rtctimer.enabled) ? "yes" : "no");
  65                 seq_printf(seq, "periodic IRQ enabled\t: %s\n",
  66                            (rtc->pie_enabled) ? "yes" : "no");
  67                 seq_printf(seq, "periodic IRQ frequency\t: %d\n",
  68                            rtc->irq_freq);
  69                 seq_printf(seq, "max user IRQ frequency\t: %d\n",
  70                            rtc->max_user_freq);
  71         }
  72
  73         seq_printf(seq, "24hr\t\t: yes\n");
  74
  75         if (ops->proc)
  76                 ops->proc(rtc->dev.parent, seq);
  77
  78         return 0;
  79 }
  80
  81 void rtc_proc_add_device(struct rtc_device *rtc)
  82 {
  83         if (is_rtc_hctosys(rtc))
  84                 proc_create_single_data("driver/rtc", 0, NULL, rtc_proc_show,
  85                                         rtc);
  86 }
  87
  88 void rtc_proc_del_device(struct rtc_device *rtc)
  89 {
  90         if (is_rtc_hctosys(rtc))
  91                 remove_proc_entry("driver/rtc", NULL);
  92 }