// SPDX-License-Identifier: GPL-2.0
/*
 * RTC subsystem, proc interface
 *
 * Copyright (C) 2005-06 Tower Technologies
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * based on arch/arm/common/rtctime.c
 */

#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include "rtc-core.h"

#define NAME_SIZE       10

#if defined(CONFIG_RTC_HCTOSYS_DEVICE)
static bool is_rtc_hctosys(struct rtc_device *rtc)
{
        int size;
        char name[NAME_SIZE];

        size = snprintf(name, NAME_SIZE, "rtc%d", rtc->id);
        if (size >= NAME_SIZE)
                return false;

        return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
}
#else
static bool is_rtc_hctosys(struct rtc_device *rtc)
{
        return (rtc->id == 0);
}
#endif

static int rtc_proc_show(struct seq_file *seq, void *offset)
{
        int err;
        struct rtc_device *rtc = seq->private;
        const struct rtc_class_ops *ops = rtc->ops;
        struct rtc_wkalrm alrm;
        struct rtc_time tm;

        err = rtc_read_time(rtc, &tm);
        if (err == 0) {
                seq_printf(seq,
                           "rtc_time\t: %ptRt\n"
                           "rtc_date\t: %ptRd\n",
                           &tm, &tm);
        }

        err = rtc_read_alarm(rtc, &alrm);
        if (err == 0) {
                seq_printf(seq, "alrm_time\t: %ptRt\n", &alrm.time);
                seq_printf(seq, "alrm_date\t: %ptRd\n", &alrm.time);
                seq_printf(seq, "alarm_IRQ\t: %s\n",
                           alrm.enabled ? "yes" : "no");
                seq_printf(seq, "alrm_pending\t: %s\n",
                           alrm.pending ? "yes" : "no");
                seq_printf(seq, "update IRQ enabled\t: %s\n",
                           (rtc->uie_rtctimer.enabled) ? "yes" : "no");
                seq_printf(seq, "periodic IRQ enabled\t: %s\n",
                           (rtc->pie_enabled) ? "yes" : "no");
                seq_printf(seq, "periodic IRQ frequency\t: %d\n",
                           rtc->irq_freq);
                seq_printf(seq, "max user IRQ frequency\t: %d\n",
                           rtc->max_user_freq);
        }

        seq_printf(seq, "24hr\t\t: yes\n");

        if (ops->proc)
                ops->proc(rtc->dev.parent, seq);

        return 0;
}

void rtc_proc_add_device(struct rtc_device *rtc)
{
        if (is_rtc_hctosys(rtc))
                proc_create_single_data("driver/rtc", 0, NULL, rtc_proc_show,
                                        rtc);
}

void rtc_proc_del_device(struct rtc_device *rtc)
{
        if (is_rtc_hctosys(rtc))
                remove_proc_entry("driver/rtc", NULL);
}