MAJOR=4
MINOR=59
DEVNAME=tty59
     #ˆÇÆƒy ?Ã¿É  Ù    #/* SPDX-License-Identifier: GPL-2.0 */
/*
 *	Generic watchdog defines. Derived from..
 *
 * Berkshire PC Watchdog Defines
 * by Ken Hollis <khollis@bitgate.com>
 *
 */
#ifndef _LINUX_WATCHDOG_H
#define _LINUX_WATCHDOG_H


#include <linux/bitops.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <uapi/linux/watchdog.h>

struct watchdog_ops;
struct watchdog_device;
struct watchdog_core_data;
struct watchdog_governor;

/** struct watchdog_ops - The watchdog-devices operations
 *
 * @owner:	The module owner.
 * @start:	The routine for starting the watchdog device.
 * @stop:	The routine for stopping the watchdog device.
 * @ping:	The routine that sends a keepalive ping to the watchdog device.
 * @status:	The routine that shows the status of the watchdog device.
 * @set_timeout:The routine for setting the watchdog devices timeout value (in seconds).
 * @set_pretimeout:The routine for setting the watchdog devices pretimeout.
 * @get_timeleft:The routine that gets the time left before a reset (in seconds).
 * @restart:	The routine for restarting the machine.
 * @ioctl:	The routines that handles extra ioctl calls.
 *
 * The watchdog_ops structure contains a list of low-level operations
 * that control a watchdog device. It also contains the module that owns
 * these operations. The start function is mandatory, all other
 * functions are optional.
 */
struct watchdog_ops {
	struct module *owner;
	/* mandatory operations */
	int (*start)(struct watchdog_device *);
	/* optional operations */
	int (*stop)(struct watchdog_device *);
	int (*ping)(struct watchdog_device *);
	unsigned int (*status)(struct watchdog_device *);
	int (*set_timeout)(struct watchdog_device *, unsigned int);
	int (*set_pretimeout)(struct watchdog_device *, unsigned int);
	unsigned int (*get_timeleft)(struct watchdog_device *);
	int (*restart)(struct watchdog_device *, unsigned long, void *);
	long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
};

/** struct watchdog_device - The structure that defines a watchdog device
 *
 * @id:		The watchdog's ID. (Allocated by watchdog_register_device)
 * @parent:	The parent bus device
 * @groups:	List of sysfs attribute groups to create when creating the
 *		watchdog device.
 * @info:	Pointer to a watchdog_info structure.
 * @ops:	Pointer to the list of watchdog operations.
 * @gov:	Pointer to watchdog pretimeout governor.
 * @bootstatus:	Status of the watchdog device at boot.
 * @timeout:	The watchdog devices timeout value (in seconds).
 * @pretimeout: The watchdog devices pre_timeout value.
 * @min_timeout:The watchdog devices minimum timeout value (in seconds).
 * @max_timeout:The watchdog devices maximum timeout value (in seconds)
 *		as configurable from user space. Only relevant if
 *		max_hw_heartbeat_ms is not provided.
 * @min_hw_heartbeat_ms:
 *		Hardware limit for minimum time between heartbeats,
 *		in milli-seconds.
 * @max_hw_heartbeat_ms:
 *		Hardware limit for maximum timeout, in milli-seconds.
 *		Replaces max_timeout if specified.
 * @reboot_nb:	The notifier block to stop watchdog on reboot.
 * @restart_nb:	The notifier block to register a restart function.
 * @driver_data:Pointer to the drivers private data.
 * @wd_data:	Pointer to watchdog core internal data.
 * @status:	Field that contains the devices internal status bits.
 * @deferred:	Entry in wtd_deferred_reg_list which is used to
 *		register early initialized watchdogs.
 *
 * The watchdog_device structure contains all information about a
 * watchdog timer device.
 *
 * The driver-data field may not be accessed directly. It must be accessed
 * via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
 */
struct watchdog_device {
	int id;
	struct device *parent;
	const struct attribute_group **groups;
	const struct watchdog_info *info;
	const struct watchdog_ops *ops;
	const struct watchdog_governor *gov;
	unsigned int bootstatus;
	unsigned int timeout;
	unsigned int pretimeout;
	unsigned int min_timeou