drivers/watchdog/watchdog_hrtimer_pretimeout.c

Source file repositories/reference/linux-study-clean/drivers/watchdog/watchdog_hrtimer_pretimeout.c

File Facts

System
Linux kernel
Corpus path
drivers/watchdog/watchdog_hrtimer_pretimeout.c
Extension
.c
Size
1226 bytes
Lines
45
Domain
Driver Families
Bucket
drivers/watchdog
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * (c) Copyright 2021 Hewlett Packard Enterprise Development LP.
 */

#include <linux/hrtimer.h>
#include <linux/watchdog.h>

#include "watchdog_core.h"
#include "watchdog_pretimeout.h"

static enum hrtimer_restart watchdog_hrtimer_pretimeout(struct hrtimer *timer)
{
	struct watchdog_core_data *wd_data;

	wd_data = container_of(timer, struct watchdog_core_data, pretimeout_timer);

	watchdog_notify_pretimeout(wd_data->wdd);
	return HRTIMER_NORESTART;
}

void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd)
{
	struct watchdog_core_data *wd_data = wdd->wd_data;

	hrtimer_setup(&wd_data->pretimeout_timer, watchdog_hrtimer_pretimeout, CLOCK_MONOTONIC,
		      HRTIMER_MODE_REL);
}

void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd)
{
	if (!(wdd->info->options & WDIOF_PRETIMEOUT) &&
	    !watchdog_pretimeout_invalid(wdd, wdd->pretimeout))
		hrtimer_start(&wdd->wd_data->pretimeout_timer,
			      ktime_set(wdd->timeout - wdd->pretimeout, 0),
			      HRTIMER_MODE_REL);
	else
		hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
}

void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd)
{
	hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
}

Annotation

Implementation Notes