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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* watchdog_core.h
*
* (c) Copyright 2008-2011 Alan Cox <alan@lxorguk.ukuu.org.uk>,
* All Rights Reserved.
*
* (c) Copyright 2008-2011 Wim Van Sebroeck <wim@iguana.be>.
*
* (c) Copyright 2021 Hewlett Packard Enterprise Development LP.
*
* 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>
*
* 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.
*/
#include <linux/hrtimer.h>
#include <linux/kthread.h>
#define MAX_DOGS 32 /* Maximum number of watchdog devices */
/*
* struct watchdog_core_data - watchdog core internal data
* @dev: The watchdog's internal device
* @cdev: The watchdog's Character device.
* @wdd: Pointer to watchdog device.
* @lock: Lock for watchdog core.
* @status: Watchdog core internal status bits.
*/
struct watchdog_core_data {
struct device dev;
struct cdev cdev;
struct watchdog_device *wdd;
struct mutex lock;
ktime_t last_keepalive;
ktime_t last_hw_keepalive;
ktime_t open_deadline;
struct hrtimer timer;
struct kthread_work work;
#if IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT)
struct hrtimer pretimeout_timer;
#endif
unsigned long status; /* Internal status bits */
#define _WDOG_DEV_OPEN 0 /* Opened ? */
#define _WDOG_ALLOW_RELEASE 1 /* Did we receive the magic char ? */
#define _WDOG_KEEPALIVE 2 /* Did we receive a keepalive ? */
};
/*
* Functions/procedures to be called by the core
*/
extern int watchdog_dev_register(struct watchdog_device *);
extern void watchdog_dev_unregister(struct watchdog_device *);
extern int __init watchdog_dev_init(void);
extern void __exit watchdog_dev_exit(void);
static inline bool watchdog_have_pretimeout(struct watchdog_device *wdd)
{
return wdd->info->options & WDIOF_PRETIMEOUT ||
IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT);
}
#if IS_ENABLED(CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT)
void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd);
void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd);
void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd);
#else
static inline void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd) {}
static inline void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd) {}
static inline void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd) {}
#endif
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