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Commit 728a2947 authored by Alessandro Zummo's avatar Alessandro Zummo Committed by Linus Torvalds
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[PATCH] RTC subsystem: proc interface 



Add the proc interface to the RTC subsystem.

The first RTC driver which registers with the class will be accessible by
/proc/driver/rtc .

This is required for compatibility with the standard RTC driver and to avoid
breaking any user space application which may erroneusly rely on this.

Signed-off-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c5c3e192

drivers/rtc/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -51,6 +51,17 @@ config RTC_INTF_SYSFS 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-sysfs.



config RTC_INTF_PROC

	tristate "proc"

	depends on RTC_CLASS && PROC_FS

	default RTC_CLASS

	help

	  Say yes here if you want to use your RTC using the proc

	  interface, /proc/driver/rtc .



	  This driver can also be built as a module. If so, the module

	  will be called rtc-proc.



comment "RTC drivers"

	depends on RTC_CLASS

drivers/rtc/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -8,4 +8,4 @@ obj-$(CONFIG_RTC_CLASS) += rtc-core.o 
rtc-core-y			:= class.o interface.o



obj-$(CONFIG_RTC_INTF_SYSFS)	+= rtc-sysfs.o

obj-$(CONFIG_RTC_INTF_PROC)	+= rtc-proc.o

drivers/rtc/rtc-proc.c

0 → 100644
+162 −0
Original line number Diff line number Diff line 
/*

 * 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;

	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 ((unsigned int)alrm.time.tm_mday <= 31)

			seq_printf(seq, "%02d\n", alrm.time.tm_mday);

		else

			seq_printf(seq, "**\n");

		seq_printf(seq, "alrm_wakeup\t: %s\n",

				alrm.enabled ? "yes" : "no");

		seq_printf(seq, "alrm_pending\t: %s\n",

				alrm.pending ? "yes" : "no");

	}



	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 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_info(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);

}



module_init(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");