Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 697fb85f authored by Rodolfo Giometti's avatar Rodolfo Giometti Committed by Linus Torvalds
Browse files

pps: LinuxPPS clients support 



Each PPS source can be registered/deregistered into the system by using
special modules called "clients".  They simply define the PPS sources'
attributes and implement the time signal registration mechanism.

This patch adds a special directory for such clients and adds a dummy
client that can be useful to test system integrity on real systems.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: default avatarRodolfo Giometti <giometti@linux.it>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Greg KH <greg@kroah.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 51e7364e

drivers/pps/Kconfig

+2 −0
Original line number Original line Diff line number Diff line
@@ -30,4 +30,6 @@ config PPS_DEBUG 
	  messages to the system log.  Select this if you are having a

	  messages to the system log.  Select this if you are having a

	  problem with PPS support and want to see more of what is going on.

	  problem with PPS support and want to see more of what is going on.





source drivers/pps/clients/Kconfig



endmenu
 
endmenu

drivers/pps/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -4,5 +4,6 @@ 




pps_core-y			:= pps.o kapi.o sysfs.o

pps_core-y			:= pps.o kapi.o sysfs.o

obj-$(CONFIG_PPS)		:= pps_core.o

obj-$(CONFIG_PPS)		:= pps_core.o

obj-y				+= clients/





ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG
 
ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG

drivers/pps/clients/Kconfig

0 → 100644
+18 −0
Original line number Original line Diff line number Diff line 
#

# PPS clients configuration

#



if PPS



comment "PPS clients support"



config PPS_CLIENT_KTIMER

	tristate "Kernel timer client (Testing client, use for debug)"

	help

	  If you say yes here you get support for a PPS debugging client

	  which uses a kernel timer to generate the PPS signal.



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

	  will be called pps-ktimer.



endif

drivers/pps/clients/Makefile

0 → 100644
+9 −0
Original line number Original line Diff line number Diff line 
#

# Makefile for PPS clients.

#



obj-$(CONFIG_PPS_CLIENT_KTIMER)	+= pps-ktimer.o



ifeq ($(CONFIG_PPS_DEBUG),y)

EXTRA_CFLAGS += -DDEBUG

endif

drivers/pps/clients/pps-ktimer.c

0 → 100644
+123 −0
Original line number Original line Diff line number Diff line 
/*

 * pps-ktimer.c -- kernel timer test client

 *

 *

 * Copyright (C) 2005-2006   Rodolfo Giometti <giometti@linux.it>

 *

 *   This program is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation; either version 2 of the License, or

 *   (at your option) any later version.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program; if not, write to the Free Software

 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */





#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/time.h>

#include <linux/timer.h>

#include <linux/pps_kernel.h>



/*

 * Global variables

 */



static int source;

static struct timer_list ktimer;



/*

 * The kernel timer

 */



static void pps_ktimer_event(unsigned long ptr)

{

	struct timespec __ts;

	struct pps_ktime ts;



	/* First of all we get the time stamp... */

	getnstimeofday(&__ts);



	pr_info("PPS event at %lu\n", jiffies);



	/* ... and translate it to PPS time data struct */

	ts.sec = __ts.tv_sec;

	ts.nsec = __ts.tv_nsec;



	pps_event(source, &ts, PPS_CAPTUREASSERT, NULL);



	mod_timer(&ktimer, jiffies + HZ);

}



/*

 * The echo function

 */



static void pps_ktimer_echo(int source, int event, void *data)

{

	pr_info("echo %s %s for source %d\n",

		event & PPS_CAPTUREASSERT ? "assert" : "",

		event & PPS_CAPTURECLEAR ? "clear" : "",

		source);

}



/*

 * The PPS info struct

 */



static struct pps_source_info pps_ktimer_info = {

	.name		= "ktimer",

	.path		= "",

	.mode		= PPS_CAPTUREASSERT | PPS_OFFSETASSERT |

			  PPS_ECHOASSERT |

			  PPS_CANWAIT | PPS_TSFMT_TSPEC,

	.echo		= pps_ktimer_echo,

	.owner		= THIS_MODULE,

};



/*

 * Module staff

 */



static void __exit pps_ktimer_exit(void)

{

	del_timer_sync(&ktimer);

	pps_unregister_source(source);



	pr_info("ktimer PPS source unregistered\n");

}



static int __init pps_ktimer_init(void)

{

	int ret;



	ret = pps_register_source(&pps_ktimer_info,

				PPS_CAPTUREASSERT | PPS_OFFSETASSERT);

	if (ret < 0) {

		printk(KERN_ERR "cannot register ktimer source\n");

		return ret;

	}

	source = ret;



	setup_timer(&ktimer, pps_ktimer_event, 0);

	mod_timer(&ktimer, jiffies + HZ);



	pr_info("ktimer PPS source registered at %d\n", source);



	return  0;

}



module_init(pps_ktimer_init);

module_exit(pps_ktimer_exit);



MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");

MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");

MODULE_LICENSE("GPL");