27c766aaac
Use the current logging styles. Make sure all output has a prefix. Add missing newlines. Remove now unnecessary PFX, NAME, and miscellaneous other #defines. Coalesce formats. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
|
|
* watchdog_core.c
|
|
*
|
|
* (c) Copyright 2008-2011 Alan Cox <alan@lxorguk.ukuu.org.uk>,
|
|
* All Rights Reserved.
|
|
*
|
|
* (c) Copyright 2008-2011 Wim Van Sebroeck <wim@iguana.be>.
|
|
*
|
|
* This source code is part of the generic code that can be used
|
|
* by all the watchdog timer drivers.
|
|
*
|
|
* Based on source code of the following authors:
|
|
* Matt Domsch <Matt_Domsch@dell.com>,
|
|
* Rob Radez <rob@osinvestor.com>,
|
|
* Rusty Lynch <rusty@linux.co.intel.com>
|
|
* Satyam Sharma <satyam@infradead.org>
|
|
* Randy Dunlap <randy.dunlap@oracle.com>
|
|
*
|
|
* 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.
|
|
*
|
|
* Neither Alan Cox, CymruNet Ltd., Wim Van Sebroeck nor Iguana vzw.
|
|
* admit liability nor provide warranty for any of this software.
|
|
* This material is provided "AS-IS" and at no charge.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h> /* For EXPORT_SYMBOL/module stuff/... */
|
|
#include <linux/types.h> /* For standard types */
|
|
#include <linux/errno.h> /* For the -ENODEV/... values */
|
|
#include <linux/kernel.h> /* For printk/panic/... */
|
|
#include <linux/watchdog.h> /* For watchdog specific items */
|
|
#include <linux/init.h> /* For __init/__exit/... */
|
|
|
|
#include "watchdog_dev.h" /* For watchdog_dev_register/... */
|
|
|
|
/**
|
|
* watchdog_register_device() - register a watchdog device
|
|
* @wdd: watchdog device
|
|
*
|
|
* Register a watchdog device with the kernel so that the
|
|
* watchdog timer can be accessed from userspace.
|
|
*
|
|
* A zero is returned on success and a negative errno code for
|
|
* failure.
|
|
*/
|
|
int watchdog_register_device(struct watchdog_device *wdd)
|
|
{
|
|
int ret;
|
|
|
|
if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
|
|
return -EINVAL;
|
|
|
|
/* Mandatory operations need to be supported */
|
|
if (wdd->ops->start == NULL || wdd->ops->stop == NULL)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Check that we have valid min and max timeout values, if
|
|
* not reset them both to 0 (=not used or unknown)
|
|
*/
|
|
if (wdd->min_timeout > wdd->max_timeout) {
|
|
pr_info("Invalid min and max timeout values, resetting to 0!\n");
|
|
wdd->min_timeout = 0;
|
|
wdd->max_timeout = 0;
|
|
}
|
|
|
|
/*
|
|
* Note: now that all watchdog_device data has been verified, we
|
|
* will not check this anymore in other functions. If data gets
|
|
* corrupted in a later stage then we expect a kernel panic!
|
|
*/
|
|
|
|
/* We only support 1 watchdog device via the /dev/watchdog interface */
|
|
ret = watchdog_dev_register(wdd);
|
|
if (ret) {
|
|
pr_err("error registering /dev/watchdog (err=%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(watchdog_register_device);
|
|
|
|
/**
|
|
* watchdog_unregister_device() - unregister a watchdog device
|
|
* @wdd: watchdog device to unregister
|
|
*
|
|
* Unregister a watchdog device that was previously successfully
|
|
* registered with watchdog_register_device().
|
|
*/
|
|
void watchdog_unregister_device(struct watchdog_device *wdd)
|
|
{
|
|
int ret;
|
|
|
|
if (wdd == NULL)
|
|
return;
|
|
|
|
ret = watchdog_dev_unregister(wdd);
|
|
if (ret)
|
|
pr_err("error unregistering /dev/watchdog (err=%d)\n", ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(watchdog_unregister_device);
|
|
|
|
MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
|
|
MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
|
|
MODULE_DESCRIPTION("WatchDog Timer Driver Core");
|
|
MODULE_LICENSE("GPL");
|