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