linux/drivers/watchdog/watchdog_hrtimer_pretimeout.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * (c) Copyright 2021 Hewlett Packard Enterprise Development LP.
   4 */
   5
   6#include <linux/hrtimer.h>
   7#include <linux/watchdog.h>
   8
   9#include "watchdog_core.h"
  10#include "watchdog_pretimeout.h"
  11
  12static enum hrtimer_restart watchdog_hrtimer_pretimeout(struct hrtimer *timer)
  13{
  14        struct watchdog_core_data *wd_data;
  15
  16        wd_data = container_of(timer, struct watchdog_core_data, pretimeout_timer);
  17
  18        watchdog_notify_pretimeout(wd_data->wdd);
  19        return HRTIMER_NORESTART;
  20}
  21
  22void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd)
  23{
  24        struct watchdog_core_data *wd_data = wdd->wd_data;
  25
  26        hrtimer_init(&wd_data->pretimeout_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
  27        wd_data->pretimeout_timer.function = watchdog_hrtimer_pretimeout;
  28}
  29
  30void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd)
  31{
  32        if (!(wdd->info->options & WDIOF_PRETIMEOUT) &&
  33            !watchdog_pretimeout_invalid(wdd, wdd->pretimeout))
  34                hrtimer_start(&wdd->wd_data->pretimeout_timer,
  35                              ktime_set(wdd->timeout - wdd->pretimeout, 0),
  36                              HRTIMER_MODE_REL);
  37        else
  38                hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
  39}
  40
  41void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd)
  42{
  43        hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
  44}
  45