| /* 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 |
