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/*
* RTC subsystem, proc interface
*
* Copyright (C) 2005-06 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* based on arch/arm/common/rtctime.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
static struct class_device *rtc_dev = NULL;
static DEFINE_MUTEX(rtc_lock);
static int rtc_proc_show(struct seq_file *seq, void *offset)
{
int err;
struct class_device *class_dev = seq->private;
const struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
struct rtc_wkalrm alrm;
struct rtc_time tm;
err = rtc_read_time(class_dev, &tm);
if (err == 0) {
seq_printf(seq,
"rtc_time\t: %02d:%02d:%02d\n"
"rtc_date\t: %04d-%02d-%02d\n",
tm.tm_hour, tm.tm_min, tm.tm_sec,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
}
err = rtc_read_alarm(class_dev, &alrm);
if (err == 0) {
seq_printf(seq, "alrm_time\t: ");
if ((unsigned int)alrm.time.tm_hour <= 24)
seq_printf(seq, "%02d:", alrm.time.tm_hour);
else
seq_printf(seq, "**:");
if ((unsigned int)alrm.time.tm_min <= 59)
seq_printf(seq, "%02d:", alrm.time.tm_min);
else
seq_printf(seq, "**:");
if ((unsigned int)alrm.time.tm_sec <= 59)
seq_printf(seq, "%02d\n", alrm.time.tm_sec);
else
seq_printf(seq, "**\n");
seq_printf(seq, "alrm_date\t: ");
if ((unsigned int)alrm.time.tm_year <= 200)
seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
else
seq_printf(seq, "****-");
if ((unsigned int)alrm.time.tm_mon <= 11)
seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
else
seq_printf(seq, "**-");
if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
seq_printf(seq, "%02d\n", alrm.time.tm_mday);
else
seq_printf(seq, "**\n");
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, "24hr\t\t: yes\n");
if (ops->proc)
ops->proc(class_dev->dev, seq);
return 0;
}
static int rtc_proc_open(struct inode *inode, struct file *file)
{
struct class_device *class_dev = PDE(inode)->data;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
return single_open(file, rtc_proc_show, class_dev);
}
static int rtc_proc_release(struct inode *inode, struct file *file)
{
int res = single_release(inode, file);
module_put(THIS_MODULE);
return res;
}
static const struct file_operations rtc_proc_fops = {
.open = rtc_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = rtc_proc_release,
};
static int rtc_proc_add_device(struct class_device *class_dev,
struct class_interface *class_intf)
{
mutex_lock(&rtc_lock);
if (rtc_dev == NULL) {
struct proc_dir_entry *ent;
rtc_dev = class_dev;
ent = create_proc_entry("driver/rtc", 0, NULL);
if (ent) {
struct rtc_device *rtc = to_rtc_device(class_dev);
ent->proc_fops = &rtc_proc_fops;
ent->owner = rtc->owner;
ent->data = class_dev;
dev_dbg(class_dev->dev, "rtc intf: proc\n");
}
else
rtc_dev = NULL;
}
mutex_unlock(&rtc_lock);
return 0;
}
static void rtc_proc_remove_device(struct class_device *class_dev,
struct class_interface *class_intf)
{
mutex_lock(&rtc_lock);
if (rtc_dev == class_dev) {
remove_proc_entry("driver/rtc", NULL);
rtc_dev = NULL;
}
mutex_unlock(&rtc_lock);
}
static struct class_interface rtc_proc_interface = {
.add = &rtc_proc_add_device,
.remove = &rtc_proc_remove_device,
};
static int __init rtc_proc_init(void)
{
return rtc_interface_register(&rtc_proc_interface);
}
static void __exit rtc_proc_exit(void)
{
class_interface_unregister(&rtc_proc_interface);
}
subsys_initcall(rtc_proc_init);
module_exit(rtc_proc_exit);
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("RTC class proc interface");
MODULE_LICENSE("GPL");
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